Well liner

I have a 67 Belvedere convertible and I need a well liner for it. There are many available depending on how many buttons that I need. However, I don't know which buttons to count. Is it just the backs ones?

Any help is appreciated.

You need to count all of the snaps.
Most 67's will need the well liner with 18 snaps, if you need help
ordering one just give me a call during the week and I can help you figure out which one you need.