Ok Mr. Detail,

The idea is to make a tool to allow you to draw the bushing into the holder without taking the holder off the car.
In order to apply force to the edge of the bushing, you need a way to accomodate the center part which sticks out. That is the purpose of the pipe flange(this is the common threaded flange used on the end of a piece of pipe to mount it to a perpendicular surface). Get a size which covers the end of the bushing and allows the center part to stick into the hole. The second identical flange allows the other end of the bushing center part clearance when it is drawn in. This is the assembly sequence for installation, arranged axially around the bushing and the bushing frame on the car;

Bolt head,large washer to cover the flange hole, Flange (convex side toward the bolt head, bushing placed between flange and bushing holder, bolt thru bushing holder, second flange (concave side toward bolt head), second washer, nut. Making sure that all is centered, tighten the bolt/nut to apply force. Stop when end of bushing is flush. It will not be recessed a few mm like the original, but that seems to have no affect on its function.
Hope this helped. Sorry, no drawing attachment possible for me. Once you get the mental picture it's a piece of cake.