I searched but could not find answer. Sorry if it is here already. Adsit and Performance both say that there are 2 different regulators for a 91 560 SEL, depending on the brand of motor. The dealer says that there is only one for my car. I'd 1) like to order before removing the panel, and 2) like to pay a more reasonable price than the dealer's $200. Anyone know the answer to which regulator I might have? TIA.