I did have the ST2500, 17x10 but only just on 7000rpm, very minimal performance. I got hold of a ST3000, dimensions were almost the same, a tad longer, removed 2mm washer from behind the mount. My custom muffler fitted perfectly. fitted the gas conversion parts, timed it and ran it up. 8100rpm with an 18x10 bolly. The P51 really performs as it should now. Nicccce!