91 z34 need replacement under frame metal holding stablizers

hi i had a friend go ask gm for the replacement braces i guess that are underneath the z34 that are welded to the body that hold the rear stablizer bar from the strut to the frame of the vehicle. but apparently they dont make those parts anymore its in there cataloge. is there an aftermarket place that makes them? or plans the build my own? im in ontario canada so if there is a place in canada too that be good its frustrating i cant get it now

Have a frame/body shop fabricate them.