has anyone ever added the split rear seats to a Rs before? do we have to drill and tap 2 holes to get them to fit in the middle or what?

I have them in my RS, not bolted down though. They stay pretty firm in place. I'm thinking of ditching the seats in a few months though, since more of my friends are starting to have cars now and my car isn't to passenger friendly. I'll just have some fiberglass enclosure dropped onto where the seats were to hold amps and subs....

was it sturdy enough to hold people in the back seat? and to also just fold one half down?