I make the kit you need to work with the 993 calipers... Look up Jeremy964 on here and the post title is "Busy weekend brakes" He is a customer of mine, and you can see pics of my basic brake kit for a set of 993 calipers. The standard kit for the front of your car that will fit under your stock 16" wheels is $415. The kit is 309X32mm front discs, the largest kit available for 16's. You can call me at 301-748-7222 if you have any questions.
Picture of 993 calipers with 309mm rotors on a 86 911, with 16's