Jeff,

I'll be interested in seeing other members' photos.

My 1954 trucks do not have those holes, and therefore no attachment plate.

A 4-hole 47-49 grommet is attached below.
And, a full set of 47-49 firewall is also attached, below (slightly different looking 4-hole grommet?).

That 4-hole grommet can be a pain to install.
Attachments
47-49 firewall grommet.jpg (25.81 KB, 190 downloads)
47-49 firewall grommet set.jpg (33.54 KB, 187 downloads)