I really dislike imperial measurements . After lots of measuring & googling I think i've figured most out - hope this helps someone. Can anyone help fill in the gaps in red? This is for a 1989 XJS if that makes a difference - I think some of these might have changed over to metric at some point.

Upper wishbone
Upper fulcrum ends to hold in upper wishbone bushes - 1/2" UNF
upper fulcrum > subframe nut - 7/16" UNF
upper fulcrum > subframe bolt 7/16 UNF x 2 1/4"
Upper balljoint mount nuts - 3/8" UNF
Upper bumpstops thread - 5/16" - 24 UNF
Upper balljoint mount bolts - unknown lengths - long/short

Upright/Lower wishbone
Stub axle - 5/8" UNF on both ends - nyloc on rear.
Spring pan>wishbone nuts/bolts/studs - 3/8" UNF
upright > lower balljoint bolts - still available as 'special bolt' w/ loctite.

lower shock to mounting bracket bolt/nut - 7/16" UNF
lower bumpstop nuts - ???
3x lockwired caliper bolts - ???

Also any others that any one knows when replacing the front suspension - steering rack/ARB mounts/links/engine mounts/engine mount supports/power steering cooler etc would be very useful!

 

There are only two caliper bolts (they are lockwired), the third bolt is steering arm to upright. The bolts are metric fine, NOT UNF. Sorry i cannot remember the size.

 

Thanks Greg, I think i'll reuse the ones I removed - I don't think they were in terrible condition (unlike the upper balljoint bolts that I had to cut off & binned!

Found another - lower shock to mounting bracket bolt/nut - 7/16" UNF

 

I replaced all my front hardware on a 1995. Caliper bolts were M12-1.25 got them from Belmetric.com. No wire holes....I use teflon thread locker. Cheap and all yellow zinc plated.
US bolts I got from Mcmaster Carr. Bump stops 5/16-24