Call Mark Reeves at Then & Now for the full 1/4s They ones AMD sells are FAR better than the goodmark ones ever! Ive used them both too
I didnt have any to sell. I have a shop and I order them from Mark when I need them. But dont wait too long these are being dropped from the inventory of AMD.
As of the GS Nationals, Mark was selling them for $400, so you should check and see if they have any left. Also where are you located? I have a GM NOS, but can't remember which side, will look tomorrow.