Never heard of a fila thunderbird
https://kansascity.craigslist.org/cto/5940011332.html
FILA was a sports wear company and they had some input into the color schemes and I think fabric choices for the interior. My wife ordered a base v6 in 85 and besides the FILA model there was ELAN and the T/C.
I had a 84 Fila. 5.0/CFI. Bought it from a Ford dealer that was working on it for a customer that couldn't pay his bill. Needed the engine rebuilt but customer didn't want to. I bought it but didn't look it over. It had been wrecked in the rear and qtrs were full of filler. Traded it off for a 87 TC that I used to do a 5 spd conversion on my automatic TC.
The Fila was a bone grey with a white leather interior.