140 Bonnet Catch Mounting Plate question

Here is a picture of BD.8428 Mounting Plate Assembly for Bonnet Catch ( big piece) and the BD.2952 Guide Plate ( smaller piece) from my ‘140.

They were rusted and over painted black, so I removed them, cleaned them up, and painted them body colour. Both Porters second edition (page 108) and Rogers book (page 350) indicate these pieces should be painted body colour.

The mounting plate is sort of an unusual piece because it bolts directly to the front of the chassis, and also bolts directly to the body. The green arrows point to the holes used to bolt the mounting plate to the chassis, the red arrows point to the holes used to bolt the plate to the body.

My questions are: should the two bolts attaching the mounting plate to the body, be painted body colour?
And, should the three bolts attaching the mounting plate to the chassis be unpainted?
I believe the answer would depend on whether the mounting plate was bolted to the body or not, when painted.
Thanks in advance for any advice.