Maybe make one? That's my plan. hot glue gun some luan together, then glass over the whole thing. Since I am planning to do that lip on the deck that wild man (I think) did, and nothing is getting glassed to the boat, I may even make it out of some leftover epoxy I have (instead of poly).
I don't know if the 21 came out in a console version. The ones I have seen are all "side console." Did tracker make a newer 21 at some point? If so this site might be useful:
http://greatlakesskipper.com/categor...-consoles.html
I have seen a lot of Mako/tracker items (switches, consoles, leaning posts, wind screens, poling platforms, etc.) pop up on this site. I ordered a gas tank from them a few years ago, which has worked out great.