[Jacques Reed]

Hi Tony and Grant,

Thanks Tony for supplying those extra dimensions. Should be an easy fabrication.
I'm betting it is 3-1/2" between centres of the bolt holes knowing how designers like to keep things simple.

Those bolts are very common on CMP's. They are 1/4-20 UNC and used to hold the dash panel, radiator grills, and windscreen hinges to name a few.

As this is a forum to exchange hints and tips here's a good one I have used occasionally which may be of interest:
Measuring things that have curvature or bends is hard to do with a tape measure due to its rigidity. I keep a bit of plastic banding tape used on heavy packages and run that around the object with appropriate tick marks then lay the banding tape out flat and measure that.

In the old days that tape was handy for opening car doors if you locked yourself out but modern designs render it ineffective.

Cheers,