Does anyone know the diameter of the 6 Volt style pick-up?

I need to know so I can mock up an adapter to fit a Pobjoy sump to my FO (1300) engine.

What have the formula Vee boys done to fit them to 1200's?

would it be possible to fit one of these to replace the original?

http://www2.cip1.com/ProductDetails.asp?ProductCode=VWC%2D043%2D101%2D149 

The Vee guys drill the case out put a 1600cc pick up in and extend the pick up down lower into the sump.