if you buy an a/l kit you normally get a couple of wooden pedestals and a baseboard without any holes. all i have done in the past is drill through the base board into the bottom of them and put a screw through. then the keel usually fits straight into the slot, keeping it in place.

however those look like metal, and judging by the size of the surprise i don't think they are going to hold very well. if there is sideways movement then the keel could actually rip off.

i know these come as part of the kit, but you would be better off using another method, or even make a better stand yourself. sorry i could not have been any real help.

Glad you got it sorted

Just a sugestion but you could try this site for a case dont know how much they are though.

http://modeldisplaycases.co.uk/index1.html