MacPherson shock absorber holder for spring plate loose

Hello all, I have here a set of actually new MacPherson shock absorbers lying, however, I have slipped for the spring plate due to a mounting error of the holding ring (I think a kind of blast ring) (see example picture). I could push the ring back into position, but it no longer holds, slips down again as soon as I tighten the spring. Now I wonder if I can somehow save the shock absorber (pull in new ring or even weld it tight) ) or whether this is a case for the scrap? Since there are no identical new parts anymore, I would have to replace the whole set, or can one mix shock absorbers from different manufacturers on one axis? Thanks and Greetings Olli