In reply to Shadowmaster: you could clove hitch them on to a bolt, might be worth using a washer. Or a hookey grip. But will be easier with a bolt hanger. You should be able to pick one up for a couple of quid.
In reply to Shadowmaster: if you get bolt hangers just clip them streight in. I was meaning the bolts that you use to fasten grips. Just put the washer on and screw it in to a t-nut and leave it sticking out by an inch then clove hitch it on. V12 also sell removeable bolts that slide on.