I have picked up some LJ Torana caster rods - not exactly sure if they fit the same as they did when I had my 510 but will find out. On my 510 I had the LJ rods threads machined further back for more adjustment - though cutting threads is not the best engineering solution... The added caster made a huge difference to handling.
Doing some reading and have short listed some Kings KDFL-01 120-220lb progressive rate springs if they fit the 810 struts. They are stated to fit a 180b/610. I'm probably leaning towards using offset standard strut tops as I'm not keen on running without sealed thrust bearings, and the aftermarket ones are rather expensive.

I did read on one of the other forums - from a popular Adelaide vendor - that the Z31 KYB front inserts are best suited to spring rates over 200lbs, and I think that spring rate would be rather skatie on a B210 on dirt, so perhaps not a great choice.
Interesting info about the 910 strut, I could understand that they would be a subtle up-rate that would work nice on dirt.

LittleFireyOne how did you find the Commo KYB dampening rate in your car? Stock Stanza springs?

Interesting fact about some aftermarket Commodore strut inserts fitting Datsun 2" struts. I think the bigger 54mm tubes (probably not disimilar to late 260Z and 280Z struts) are required to fit bigger Bilstein inserts.

My longer term plan is to just shorten a H190 from perhaps an S12 or Bluebird. I've considered shortening an R31 BW78 but the factory LSD's are crap - stuck with spending $2500 on a KAAZ and only upto 4.11 gears are commonly available. I worked for a company (PRB/Birkin) that used BW68 diffs in their clubman/Lotus 7 live axle car and we had some LSD's custom built, but that too was stupidly expensive.
I have a lathe so I can clean up axle flanges if shortening a diff by that method. (I hate cutting threads - not too interested in DIY coil overs...).
Thanks for the heads up on engine mounts. I weld chromoly 2WD extreme off road buggies for a work, so I can get a little creative with the TIG/MIG to help the motor fit.
I may consider converting my 810 struts to 54mm Commodore tubes by boring the stubs out on my mill and welding the extracted Commodore tubes in. Considering running Commodore KYB Exel-G's at around $130 a pair whilst saving to buy a set of valved Commodore Bilsteins. I read the larger Bilsteins are great for longer events as they have a larger piston and don't overheat quickly - though currently my longest rally sprint run is around 7 minutes. Hmmm

My B210 is an early 1976 Jap spec car with H150 etc. I picked up a late model Borg Warner diff for something a bit stronger and I have a few spare centres to weld up before building a proper shortened LSD diff. I picked up the 810 for the L20b and I will stitch on some engine mounts (from a wrecked Stanza, 610 cross members are not so common any more...). I plan to use the 810 struts as I'm considering club registering the car, and not having adapters etc for brakes simplifies engineering certification in Victoria, Australia. I'm also thinking 2" struts opens up a few extra options for inserts and coil over kits.
What springs are common use with the VW Golf/Rabbit Bilsteins in shortened struts?

Hi,
I have a B210 120Y sedan which I am restoring for club autocross, rally sprinting and the odd tarmac event.
I'm looking to build some struts and I have a pair of Sumitomo iron calipers and 200b struts to begin with. Any recommendations on a good setup? Unfortunately most info out there is to suit heavier 510's, though I am planning to run an L20b.
The local track is relatively smooth and my current club car, an LS1 VX doesn't bottom being lowered, so lowering a little is desired.
I'm considering a budget setup of Z31 KYB's, shortened struts and a perhaps King springs (ideal PN #???) or a coil over setup with perhaps a 175lb spring, but I'm wondering if this is 'over shocking' the front?
I'm also wondering about Bilstein setups that work and any info on Commodore strut tube conversions. Any words of wisdom for our light cars is much appreciated.
Rob

Recently discovered a friend has used Commodore wagon Bilstein rear shocks on a Corolla (KE20) rally car with good reports

Bilstein 24-003179 will fit rear B210 sedans. Also will fit early RX7. 12.70" collapsed, 20.16" extended

Bilstein 24-001540 will also fit and is similar size. A friend has these on his 1600/510 sedan. I think these are to suit an early Corolla and '80's Mazda 626. 13.82" collapsed, 21.77" extended

Bilstein 34-184530 is the front VW Rabbit/Jetta cartridge insert part number. 15.12" collapsed, 19.74" extended.

Google part numbers for prices and additional info

The RX7 S1-S3 rear KYB Gas-A-Just shock is now very hard to come by as it appears to be no longer available, shelf stock only. Even the U.S. sites don't seem to have much.