Anyone got a knackered adventure top box?

I'm looking for the stainless mounting plate from the underside of an adventure top box (the bit that hooks into the lugs on the top box mounting rack).
I want to back able to mount my little 'Vern' top box quickly for 'non-trip' use - at the moment it's bolted down and I have to faff around with bolts and spacers etc every time I swap for my big top box.

Ta
Matt

You could put a mounting plate on the base rack then all you need to do is unbolt the GSA top rack.