SW Motech racks are made for specific bike models, hence you need the one for the ST (same model for ES or non ES in my knowledge). Used the quick release rack with ADVTrax panniers over 28,000km on bad/dirt roads. The cross bar of the rack broke off on the weld after some really hard pounding on Laos' dirt tracks but was easy to weld. Locks of panniers are a bit low end but with a little grease (or soap as in my case) they work fine. Would buy the rack and panniers anytime again