All this talk has got me curious.

What are the ratios available in the 145? I only know of the 3.9 (std 1200)
H165? I have a 4.11 (roadstar, Z20 vannette), know of 4.875 (A12 Vannette), heard of 3.7 (some bluebird?), now a 4.4? What models did they come in? (Someone said 411 bluebird station wagon? They're like hens teeth even here in NZ except possibly even more scarce as hens teeth don't rust as badly.)
And is there definitely an alloy carrier for the H165? I've only ever seen one alloy carrier (vannette) and it looked bigger and had 10 bolts, I assumed it must have been an H190. If the alloy 165 does exist what models did they come out in? I would love one.
And

There is very little available for the H145 now days, I blew my 4.6 at manfield a little over a year ago and after investigation found it was going to be better for me in the long run to change to a H165 (which I duly did). I understand the only ration available for the H145 is the 3.9 (I still have my 4.6 but the pinion looks like a cotton reel).

H165 - available ex road going vehicle, 3.7, 3.9, 4.111 & 4.875
Nismo have listed for the H165 a 4.375 (some call this 4.4) & 4.675 (or there abouts) and are priced accordingly.
Now I understand the the odd vehicle (vanette, don't know which model) had the 4.4 & 4.6, so i'm wondering round as many wreckers as possible with my eyes wide open!

hope this helps

I just posted a pic in the miscellaneous section of the photo album of the C120 van diff ratios and models from the parts fiche. It shows 4.375 and 4.625 ratios available in euro models with A15 and more.

thanks heaps

Also check the Diff tech section article, there is a bunch of ratio info in there.

The 1000 ute usually had the 4.375 and the dat 1600 wagon the alloy h190. The early datsun bluebirds 64-67 the alloy h165 and maybe a h190 lsd from the fairlady as an option for the sss. Many early datsun pre 72 with live axles had the alloy centres. As for the h190 240-280 I dont know.