On second thought, perhaps go with Sparco-specific sidemounts Scott:
http://www.sparcousa.com/seats_acc.asp
And you should get some hardware for mounting. Four bolts for the sidemount to fix into the seat (2 on each side), and four bolts to affix the sidemounts onto your VAC floormounts (also 2 on each side)
p.s. it looks like the steel sidemounts have more bottom holes (so you'll have more options in terms of fitment/adjustability. Plus, they're a lot cheaper than the aluminum brackets that Sparco offers.