15x6.5 Flat 15 Slot from a W124 of 89-94 vintage. Possibly purchased from Wheel Collision Center in Bath, PA too.
That is exactly what Nathan said! I think they are 16X8s http://forums.vwvortex.com/showthread.php?5640066-Mercedes-15-slot-16x8-et-34-with-adapters.&p=76694229
Nathan was the closest. 16" from a C124 (they also may have been available on the w124). Came from a different alloy wheel distributor complete with conversions.
Lol Eric - from that pic it looks decent - tires do not look like they are stretched to hell - would need a close up of the wheel / tire to confirm.