Hope this could be of help to someone... (Was making 'em anyways)
From memory there is a printable version on the Archer website(?) but I have found it to be a little off kilter... This one I made was definitely trial and error, and is a beaut fit... The styrene is a little under 1mm thickness...
Apologies for the dull pic though...

A couple of measurements...
The whole thing is 143mm long... The width (15mm) of the end with the notch needs to be sanded/graded to a wedge, (on account of the glacis angle under the front end of the M4 sponson...) you will realise this when dry fitting it... As I said, the rest are trial and error... With one finished you can easily use it as a template for the second...
Cheers
Brad














