When I did this on my car I rewired the GenII seat entirely to work with my older GenI wiring.....the new seats had memory functions and everything. I removed all that and re-did them to match the old setup. Lots of soldering....and I "lost" power headrests....but I have the wires laying under the seats, so should they ever need to be adjusted (unlikely) a 9V battery or a cord to the power outlet in the car will do the trick. 
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
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