http://www.318ti.org/forum/showthread.php?t=32229 Ed lists the part number for the calipers on the 3rd page or so. Pretty sure those are 993 calipers, no? Looks like the 351426 part number is for that model span of 911.
I think they look great, and I'm sure they are very good calipers, but the market for this kind of thing is rather small, that's all I was saying.