All 88 cars were MAF in Cal. All Saleens were built in Cal. in 88 so that is why it's a MAF car. They were ordered through a Ford dealer for Saleen for conversion.
When I got the 86 I have now the dealer didn't have t-top keys. I tried the one from the car I was trading in and it was the same number. See if someone has a t-top car in your area and try the key. They aren't that precision a cut.