Needless to say, there aren't many cards of him. When I went to COMC to look, I found that there are some old tobacco cards. I don't collect tobacco cards, though, and am not really interested in starting. There are also reprints of tobacco cards. Not terribly compelling, in my view. More up my alley is this standard-sized card, a 2012 Panini Cooperstown Bronze History card, of his Hall of Fame plaque, numbered 341/599. This is still an outlier in my collection, since I barely have any cards post-1994. With this (and another card at the bottom of this post), I now have exactly 20 cards manufactured after 1994 out of approximately 30,000 cards in my collection.
When I looked for a card of him, I found two options: the Conlon Collection, and the Panini Cooperstown Bronze History plaque card. I figured since I was getting the Panini card for Willis, I should get something different for McGowan, and of course it's good to have a card with a photo of the guy, too. There are a couple of different Conlon cards of him; this one, from 1993, explains that his nickname came from using an undersized chest protector.