I can't say enough good about these guys:
https://durafitseatcovers.com/search.php?search_query=%22C937%22&ymmq=yr_1979~mk_chevrolet~vv_silverado~jh_front~ru_solid-bench
I have not tried their cover for a bench seat, but the covers they built for a 1995 60/40 split (which I have mounted in my...