I cannot tell you for sure, but if you had do much more than drill an
extra hole or two I would be very surprised. Making assembly differences
needs a great deal of justification. I don't see ford doing that.
Personally if a convertible needed a different console I would use the
same attachment points and put all the design differences in the console
subassembly.

Get as many brackets, fasteners, clips, etc as you can when you remove it
from the junkyard car. As you remove it, you should be able to see how
it's put in. From there you'll know if it will be a big deal to put in
your car or not provided you've looked your car over well.

And if it's a no go, you can just leave it in the car at the junkyard.

i called greens and the part number for all 91 mustangs are the same.
it does not matter if it is a convertible or a lx or at hatch back. if
anyone here does not know what greens is, it is an after market ford
parts dealer. they are reliable, but expensive. the number is
5137313304. even if you do not buy from them they are useful for
informational purposes.