I have tried both conversions, and found the 120y disc conversion is by far the easiest, it makes the brakes less "grabby". If you don't mind the extra work and cost then the stanza/200b/910 upgrade is by far the best. I now have the 910 front brakes/suspension and they work best.

I have fitted the larger diameter strut, with new inserts fitted shortened the tube by 20mm, They do fit but only just. I am looking at fitting the 1200 spring platform and springs as I don't like the harse ride, clearance is also an issue on full lock.

To make the 910 struts fit, 310 sunny bottom arms, ball joints and steering arms are required, also don't forget to remove the residual line pressure valve from the Master cylinder.

The 310 bottom ball joints are required as the taper is bigger and they are also longer in the body, so that less lowering is required to get the right camber. This increases the track by about 25mm. This in-turn allows you to run a larger offset wheel like the TRX rim, up to about 6" wide before it extrudes the guard.

Sunny Bottom arms are required as the lock stop radius bracket is a different shape to the standard 1200 bottom arm.

You will also need to have a spacer made up to fit the sunny steering arm to the strut. the bolt holes are the same but the spigot on the 310 arm is alot smaller.