[rwt65]

If possible,can I buy spring perches?
Make or buy, what do people do/use?
Am putting WT diffs under my NT n chasing 4

[jdk81]

I bought a set from tsor (not operating any more)
I didn't bother getting them again, the simple ones were fine, the one I didn't want to make myself was miles out of fitting properly, and took a lot of fiddling to get sitting nice.

Careful cutting you can reuse your old perches.

Or a set of verniers and set of holesaws and grinder and you can make your own

[Shandy]

I just did this job and was in the same place. I only did the rear so I've only half the story.
I got some 50x100 rhs that was lying around and used a hole saw. The rear is 65mm which requires you to drill it off centre by approx. 11mm centre to centre.
then cut in to two pieces. Then I put the two pieces in the vice to make sure that the spring centring dowel is level. its a 14mm if I can remember.
Hope that helps.

[alien]

^^this is how mine are made.

Be careful when you cut though - if you're SPUA and you leave a bit too much meat on you'll essentially be adding lowering blocks =)