Threaded plates in door jamb for strikers

[matrout76]

i'm getting ready to install my quarter panels and the threaded plates for the door strikers to attach to are missing.  I know the strikers were removed by the PO and i found them in a box, but cannot find the threaded plates. 

I have searched the online stores and do not know the correct name and cannot find them for sale with the strikers.  I can make them if i have to...but would rather buy them.

The photo is a screenshot that was taken at 39:05 of this video:  https://www.youtube.com/watch?v=Ln9P9MhRHME&t=3281s 

Any help in locating these pieces would be greatly appreciated!

Thanks!
Matt

[Bronzedodge]

Super easy to make.  That might be easier.

[matrout76]

With the lack of replies...that is what i am leaning towards.

I will probably make them oversized since there are some cracks that have been repaired in the jambs. 

Thanks!