umm, a 540 sports tuned motor which is a 540 can has a different sized bushing to that of a stock motor. i suggest just removing the bushings from your 23t motor and measuring the outside diameter, the inside hole diameter and the thickness of the bushing. try VBX bearings, or do an ebay search for a bearing of the same dimensions as your bushings.
==\_\___===___ | *HPI Baja SS kit;*
==(@)\_______\(o) +UNDER CONSTRUCTION+
out of racing, but a proud marshall, lol