ESP Pump Heads: Which Ones Fit?

Hello everyone,

I spent some time playing with the ECAT yesterday.
Result: There are many pumps available with 11 and 12 mm pistons. However, this indicates customers such as Cummins, Rover, Detroit, GM, etc.

Can we assume that the pump head of a VE4/1xxxxx is always the same, so that the head of any VE4 will fit on my pump from an AFN? (It looks that way in the photos!)
Can the Bosch designation be used to determine which pumps have the same pump heads (even with different pistons)?

'Is anyone selling pump heads for 11-series or 12-series pumps?'

Why don't you contact Bosch directly? They offer all ESP components as spare parts.
Find a patient and capable employee and have them identify which housings are identical across different pump heads, including those with different piston sizes.
He might also know directly what would be a good fit.