Shane, don't understand why you would want one but we have our sponsors on here that can hook you up.
WBCycle (Nelson) sells BDM parts and yes they make the cooler and matching stash tube for the other leg.
McGroom offers lots of other parts and can get you about anything.
Maddog has the oil filters (re-usable) that may offer some cooling.
Contact them and they will hook you up.
