There is a plate in there that retains the nuts for the striker. You do not want to rig up something to replace that as the door striker is a hard point in the safety of that car. It holds against a lot of force in a collision or similar event. The plate keeps the striker from pulling free from the pillar.
Probably the easiest solution would be to hit a salvage yard and get a replacement part and use it. That would give you the ability to see how it comes apart and goes together before working on the good vehicle.
Or if you can get a magnetic part retriever down in the hole the plate went you might be able to fish out the old one.
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Wednesday, July 12th, 2017 AT 9:04 PM