Since I Realllly want to get this thing on the road, it will be ten years at the end of the month........I spent a half hour at the local parts store with a dial calipers in hand, and ended up with a Raybestos SC360018. My donor list has now expanded to include Mazda, 1993 MX-6 to be exact. I built a new bracket this afternoon, and if I can get a 10mm to AN4 adaptor locally I'll be driving the Cobra Friday after work!
Thanks for all of the help!!
Jon