The "L" shape piece t are corner keys for Silverline/American Craftsman vinyl brickmould.

A distributor from madison tn 37075 says:
June 26, 2018
See attached size. We need to order several keys from you if possible.
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Casey from SWISCO responded:
June 29, 2018

Hello,

We'd be happy to help you find some replacement corners, but we'll need the width and thickness of the leg to get started. Thank you!
A distributor from madison tn 37075 says:
July 3, 2018
the thickness is 1/4 inch and the width is 1/4 inch
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Dave Sr. from SWISCO responded:
July 11, 2018

Take a look at our 95-002 and 95-201. They are not 1/4" x 1/4", but I think will work for your repair. See what you think.
Capitol Window Panel Corner, 3/16" x 3/16"
Capitol Window Panel Corner, 3/16" x 3/16"
95-002
$0.74
Press-fit Corner Key With Guide
Press-fit Corner Key With Guide
95-201
$0.67
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