What size/style lugs needed for prostars up front???

What size/style lugs needed for 15x3.5" prostars up front on a stock 94 camaro z28 -

Check the FAQ, stickied at the top of the "Wheels and Tires" topic listing.

To run Weld Pro-Stars, you need to use the lugs recommended by Weld, and they are "X-tra long mag-shank" style, 1.380" shank length x 0.687" diameter, 12mm x 1.5 threads.

You will need a 5/16" spacer in the front. That then requires that you need to install longer studs, to pass NHRA tech. See the details in the FAQ.