Hoping people who have done conversions using the belt driven 4.2 40V (pre-FSI) engines would know how many different engine to trans bolt patterns there are and which use which?

Reason is I’m trying to determine if either 8HP55/65/90/95a bolt up with BCY/BRV from C5 RS6…. I’m aware a spacer is needed also just trying to find something that bolts up first.

Failing that which bolt to AWN/ANK/ARS etc

Chassis is a C5 RS6

Electronics isn’t 100% resolved but I do know what I’ll be using

Appreciate anyone’s info re the above