OK,so does it have a vacuum pump for the door locks? If so, I'd send it back and get the one from Crutchfieds (an Omega). They are less than $100 and we've well documented their installation. For those with w126s, just email me (bstreep@satx.rr.com) and I'll send you the changes that another member made.)

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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)