I would not glue at all, that type plastic will seem to glue but the joint will have no strength and give pretty quickly.
I'd be looking at screws or pop rivets into plastic with a metal made tab of some sort. Improvise, I've done it and the resulting parts are still going after years of use, it's actually stronger than the original tab. I have a broken up Focus radiator shroud like that and still quite solid when pulling it out after 5 years, it was in a wreck and patched back together from like 5 separate pieces. Or if any tab length left, drill small hole in it and thread some mechanics wire in and around the head of a bolt in proper place. Done clean it doesn't look too obtrusive and again lasts forever. Got two Contour headlights like that for 13+ years now, no way was I paying $180 each for those headlight assemblies.