+1 for B4 roll bar kit. Also get yourself some of the roll bar fasteners from the Cougar SV - these allow you to mount the roll bar to the rear of the shock tower (so you don't need to cut a slot in the bulkhead) and they have a grub screw that allows you to set the "slop" so you can run different thickness roll bars easily. Think they are about £5 for 4 (you only need 2, so you either have spares or you can share with a friend).
Unless you reshape the wire, you may need to dremel the shock tower a bit to ensure the roll bar doesn't rub on it where the bend in the wire is.
HTH