studs are also available in "grab packs" from Repco, Autopro etc. I cannot remember the brand (maybe Champion) they are on a carousel stand in the local shops that I have seen. If they don't have the size that you are after they may be able to order them for you.
Of course can always cut the Booker bar. In which case one sees little reason to post here.
Personally I feel going to the ARP catalogue for the intake and exhaust flanges is just extravagant. The manufacturing techniques that make ARP fasteners so good are just not relevant to holding your intake manifold on.
P.S don't forget your local Toyota dealership for the studs.