Roy,
my friend Alan is considering the same coil-over / tubular control arm conversion kit for his Butler. He said to tell you that the parts are available in England, and there is an update on Moss. He spoke with Ron Butler about it, twice in the last year, and Ron apparently has a source in England for them too. Two of our local Jaguar service repair shops said they could get the MG parts from England too.
About MOSS:
Alan just called them, they are currently machining up conversion kits now that will be available in two weeks, according to MOSS.
I hope this helps... we'll probably do Alan's car in the next few months. Let me know how the parts look when you get them and how everything bolts up. Alan is at:
ahaynes7232@attbi.com
See Ya.