Hello mate,
The headstock is certainly smaller than the OEM one. When I did my custom RCA4 I laser cut a new control cover, pickup mounts and truss rod cover in 3mm acrylic and 3mm ply. The truss rod cover is the correct shape and size for your headstock.
The link to my build in below in the signature.
I used the acrylic parts, but was planning on staining the ply and using them instead originally. When the stain looked crappy I binned the pickup covers, but I have just found the other parts pictured laying on the top shelf under a layer of dust. I also have the original white scratch plate. You can have the lot, either you can paint and badge this truss rod cover or use it as a template to cut one from my scratch plate to match your plate.
PM me with your address and I'll pop them in the post if you want them.
Here is the acrylic one on my bass, same shape and size...
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