AMP regulator in Wildcat mk1?

Breather hole locations if measure from the rear end of the air tube are will show different measurements, so, yes, different locations.

it best to do what YO! suggests, and that is to install a Huma reg. If not getting the power plenum, you must specify if your WC is pre AMP or post AMP, as the spacer lengths that accompany the Huma reg’s are different by 23mm.