If they are the same as a 2G dsm, here is a genuine Mitsi one on ebay. Import evolution also have a web site and will send to australia so their postage will be much better priced, so id ask for a quote.
http://www.ebay.com/itm/Eclipse-Talon-DSM-OEM-Timing-Belt-Tensioner-1g-92-5-94-/230360251863?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item35a28a7dd7
Searched "tensioner" on extremepsi and one of these should fit, im not an evo person so the other guys will tell you if the 2G dsm one fits an evo motor, im more clued up onto what 1G dsm gear fits the vr4.
http://www.extremepsi.com/store/search.php?mode=search&page=1