binder bolts

[Bill C]

anyone point me in the right direction for seat binder bolts for Thorn frames,
I've tried m6 allen, it threads in but the socket head is to big to fit inside the recess, I need 3 as i have three frames without
alternatively i could just get the Thorn quick releases, thought i'd ask just in case i'm entering the wrong search on their site as i drew a blank

thanks

[Bill C]

sorted it cleaned paint build up and now a REALLY snug fit 
who'd a thunk a bit of paint could make that much difference