While they (the stang front fenders and hood) will bolt on to a later model LTD II. I don't see anyway that would even come close to the cougar/T-bird plat forms. Just my .02
I'm planning on installing a Griggs SLA as well to go with the 03' Cobra IRS i've installed. I used to have a 90' Lincoln LSC 8.8 L/S disc brake rear in my Bird. Bolted right in. But I removed and sold it to get the IRS I put in. I still have the front spindles and calipers on my car though.
