I'd been thinking about this. As you may already know, Aguilar don't make ears for the TH500 (I asked them!). However, based on the dimensions of the TH, I think you could use MarkBass LMII ears. The LM is fractionally wider, but I figured if you use automotive double sided tape (this stuff is really strong) to mount the ears to the sides of the head, this would shim the difference (and avoid drilling theTH) Then make a couple of wood spacers and tape them towards the rear of the head, top and bottom, between either the rack case (if you are using single space) or other rack components. If this sounds feasible but you need more instructions, pm me for a diagram.