My bigsby broke on my epiphone riviera and i never use the bigsby so would like to replace it with a stop tail. However i dont know if standard ones would fit.

I would like to know if a regular stop tail would fit and if not there is there a alternative
take a photo and some of us can help you out.

thankfully even the lowest end stoptails on ebay will fit/work with all the way from low end no name chinese guitars to high end usa production model guitars. The material of the cheapest ones are zinc if it helps.
I'm yet to see a stoptail you wouldn't have to is the bad news. My best advice even though you're not big on the bigsby is find some replacement parts on ebay.
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
Krank 1980 Jr 20watt
Krank Rev 4x12 (eminence V12)
GFS Greenie/Digitech Bad Monkey
Morley Bad Horsie 2
MXR Smart Gate