2006 sierra tonneau cover questions

I have a 2006, extended cab 6.5 bed, sierra. Recently a friend of mine had given me a snap tonneau cover made by tonneau masters. The cover is in good shape it just needs a few snaps replaced. I searched the internet for replacement parts and from what I found out tonneau master has went out of business. I had found a website that said to use berlin replacement covers for tonneau masters. Does anyone know if any replacement snaps from any manufacturer will work? Where can I find black replacement snaps? If I need to replace the cover will any manufacturer work on the same frame? Thanks.