Can't think of any with a pony logo. The pre-2010 GT/CS had light inserts in dark seats and the color accent option on the later cars gave you a thin colored stripe in the middle of the seat. The skunk striped GT500 seats are the only other 2 tone chairs I can think of but they have the snake logo.
Yeah I saw one the seats are leather black with white inserts and pony logo on the upper part of the seat. Tried to load picture but it's asking for url, so in my ignorance how to do it I can't show you. Doesn't look aftermarket, pretty sure they were stock.
I've never seen that upholstery before. The manual height adjuster on the driver's seat makes me think that's a base car that came with cloth seats and that the 2 tone leather is aftermarket.