Boards
The plural of vinyl is vinyl.
Just a heads-up, so you can stop saying/typing "vinyls". Cos doing so makes you sound like you buy your music exclusively from Urban Outfitters.
No need to apologise. We've all been out of our depth at one point or other. And we learn from our mistakes, yeah?
Some other plural options: records, LPs, albums, vinyl records.
This has been a public service announcement. Thank you for your avoidance of this increasingly widespread "vinyls" wrongness.