Not all that familiar with the M3 Lee, and was curious what tracks would be right for it, besides the solid rubber ones. Same question goes with M12 GMC(Academy), since I probably won't be using the in box tracks for either one at the moment. Thanks!

well believe it or not, any after market track for the m4 sherman will work on both. but for the lee i'd look for a rubber type cleet, and maybe steel chevron for the sherman stug

For the M3 Lee, any of the following would be ok: T41(smooth rubber), T48(chevroned rubber), T49(parallel bar - steel), & T51(smooth rubber).
For the M12, any of these: T48( chevroned rubber), T49( parallel bar - steel), T51(smooth rubber), & T54E1(chevroned steel).

AFV CLUB (injected styrene) offers the T48 & T9
RHPS (injected styrene) offers(d) the T48, T49, T51, & T54E1- these I think are OOP.
Friulmodel (white metal) offers the T48, T51, & T54E1,
Modelkasten (injection) offers T48, T48 w/duckbill end connectors, T49, T51 & T54E1
Resicast (resin) offers the T49
There may be other sets I missed out there...

Very good. Since all I want to do is build the Lee out of the box, I could use the M12 GMC's tracks from Academy, and use T48(rubber chevron?) tracks on the M12. *smile* Thanks, guys.