In this case, no. He has the older style Trimark locksets, not FIC.
My guess is you'll need one of these gold blanks, as they don't make the original style nickel square ones. Your original was probably a TM prefix, and probably in the 100 or 200 range, if that helps you narrow down.
TriMark Locks for Sale
Maybe give them a call first to make sure you get the right one. If you have another key and can get the number off of it, they may be able to send you one pre-cut.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR