[SSS]

Does an FFR require a donor car? NO. You could put in new parts in place of every 'donor' part. But, those new parts must be exchangeable for the equivalent '87 to '93 Mustang part or you'll have to modify something to use it.

You can utilize the suspension from an '87 to '93 'donor' car, or you could buy FFR's custom suspension parts. You'll still need an 8.8" Ford rear or IRS, which could be new or used.