They might be. You will have to try them to see. Check to see if the '97 has the 16 inch wheels for the oversize calipers. If so, the '87 most likely has the 15 inch wheels. They would only fit in this case with wheel spacers, 1.25 inch, and then you will have to grind down the top of the caliper say 1/32 of an inch to fit the wheel. If both wheels are 15 inch. then a fit sounds good.
Mercury Grand Marquis was created in 1983.
Physically, yes. It would be best to consult an interchange reference to know if the wiring and programming are compatible.
Wheels from a concurrent Mercury Grand Marquis or a Lincoln Town Car would fit.
yes 26" rims could fit on it
.054 is the gap for the Mercury Grand Marquis.
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No , the last model year for the Mercury Grand Marquis was the 2011 model
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yes
Mercury changed the style of the Grand Marquis in 1995. 92-94 are compatible, 95-97 are compatible. You might be able to force it and figure out a way to get it to work, but it probably wont look good. My family have a 1993 and 1997 Marquis, and the front ends are different.
The first generation of Mercury Grand Marquis cars has been in production since 1975. The last Mercury Grand Marquis was manufactured in January 2011.