I am wondering if someone can tell me what rt3 mount this is? I purchased from a guy over the weekend for it to fit my 03 Chev 2500HD and he said it was the correct mount. I checked the dimensions Boss publishes and they come out to the 34" and 16-3/8", so I assumed it is the right mount. However after a closer look, the top surface of the rt3 tabs are straight where all of the mounts I see have a stepped surface. Also the side brackets don't match the mounting holes. Any help would be great if anyone has seen this? Is this possibly any early generation rt3 mount?