Not a newbie but have been off the forum for a number of years. Just startling my second build, an MKIV which the owner purchased in 2015 but never started, none of the boxes were even opened. This build includes the IRS option and requires a 1992 to 1997 Thunderbird V-8 differential that I will have to source. The newer, more recent MKIV’s with IRS require a 2015 or later Mustang differential but that won’t work for this car. Can anyone point me in the right direction to find this older differential. Have contacted a few salvage yards but no luck so far. That vintage is probably getting to be pretty old. Thanks for any help.