Matt- Your 1990 Imperial has either a Bosch or Bendix ABS unit on it. Bosch was used for about the first six months of the production run in 1990. If yours has Bosch, I can tell you with absolute certainty that no reman units are available and you must buy a new one from a Mopar dealer. The cheapest I found was $1100.00. If yours is Bendix, parts are plentiful and much less expensive. At one time, Chrysler extended the warranty on Bendix ABS units to 100,000 miles...there's lots of info on the allpar.com website. Finally, it raises a question in my mind that a $1500 collision would penetrate the car deeply enough to damage the ABS unit. Low brake fluid will set off the warning lights. Also, check the manual for trouble codes which you can display via a blinking brake warning light. What symptoms does the unit display besides the warning lights? Phil Brust Jefferson GA 73 & 82 Imperial