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I have never seen one, but you want to talk to Jim Demic, but I can not find his email address. He is the one who can tell you all about anything deTomaso.
yeah, I think those are worthless these days. Tell ya what! I'll take it off your hands for the cost of shipping! 
Seriously, it almost looks like an FIM Plast model, but doesn't have enough detail, the correct window contour at the door, or the same wheels. The Shell promo model is very lacking in detail. Probably a cheap promo model to promote their gas. They had a sportscar collection promotion in the early 90's (late 80's) with similar lack of detail.
Good luck!
Seriously, it almost looks like an FIM Plast model, but doesn't have enough detail, the correct window contour at the door, or the same wheels. The Shell promo model is very lacking in detail. Probably a cheap promo model to promote their gas. They had a sportscar collection promotion in the early 90's (late 80's) with similar lack of detail.
Good luck!