Convertible Top Snaps

I haven't got that far in my build yet but I did some research.
http://www.althafastener.com/stainless-steel-snap-fastener-socket-standard-_p_137.html

http://www.sailrite.com/Snap-Fastener-Machine-Screw-3-8-8-32-Nickel-Plated-Key-H

http://www.sailrite.com/Snap-Fastener-Screw-Stud-3-8-Stainless-Steel-Key-SSE

I hope this helps.
Jim