I emailed John a few weeks ago to ask him what he used, this is his reply?
I read a lot on the locost forums last night, and apparantly cortina uprights are hard to find. I guess I could use the manta ones. I'd prefer something a bit taller though!
The sierra rears look great, easy to make uprights for. I found a few threads on the different sierra rear ends, and I'll definately go for the Lobro shafts and a LSD. I'll probably bite the bullet and go for a 7.5" diff, but I don't know what ratios are availabe for it.
Do you have contact info for Geoff Berrisford, as I think I'll need to get custom shafts made due to the wide track of the car width the 400 kit on it.
I had a good look at the Luego and GTS sites, and they look great. I'm a little wary about purchasing kit car suspension stuff for a car of double the weight and eventually double the power… that's what put me of the westfield alloy uprights. I could be completely wrong though. Are the westfield ones cortina copys?
I had a play with the SusProg3D demo program last night, and it looks great, well worth 300 aussie dollars (£125). I'm going to measure up the track and manta uprights tonight and see how the standard suspension was set up. Should be interesting.