Door mirror reinforcing plates?

[saltdog]

I replaced my 83 Suburban K20 large towing mirrors with the compact ones from LMC, but they've always vibrated quite a bit. I saw these and got them before they went out of stock hoping they may solve the problem, but can't find any info about installation.
Wondered if anyone has installed things?

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[RaisedK5]

Kinda hard to see but the tab catches a screw from the inside to hold the plate in place and the screws from the outside just screw into it from what I remember. When it gets over -10 I might be able to find my old mirrors in the garage to show you the factory parts.

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[saltdog]

Ok awesome! this is exactly what I was looking for! Thanks @RaisedK5

 

[saltdog]

Well after more digging it turns out you can't use those plates with the below eye line mirrors, just the little sport mirrors. But I did find these on ebay:
GM part is Reinforcement, Mir Brkt 14007541 (LH), 14007542 (RH) all discontinued natch, but on the way!

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