1.6tdi (2015) oil pump seal

Hi

I'm in the middle of trying to resurrect a 1.6tdi that had the oil pump wet belt fail. I've collected most bits and pieces but one part evades me and I've a question regarding the oil pump retaining bolts. There is a small seal on the pump outlet to the cylinder block and this should be replaced, it's an odd shape, squarish and then rounded. I need a part number and is it only available from the dealer network? Also the pump bolts apparently require replacement when removed, is this obligatory?

Many thanks in advance.

Regards

Trevor