If you're referring to BRP's ACS, with its air-bag, compressor, and height sensing/pressure adjusting system, I'm pretty there's only one model available from BRP - but please realise that it's
NOT an 'Air-shock' by any stretch of the imagination!! :lecturef_smilie:
The ACS started out fitted standard to the Ltd RT's & has since been expanded to some other models. But it is an integrated system, so while it may well fit or be able to be fitted onto an ST, I'm not sure if the Computer on your machine will be able to manage/control it once fitted. But even if it does fit & can be worked within the limits of the computer's systems, if it ever works properly (many don't ever; and many more have regular failures!

) it really won't be able to do anything but automatically manage the static ryde height for you! It's just an air-bag (not part of or involved with the shock &/or coil in any way that seriously varies spring rates or rebound etc) that is inflated/deflated according to a preset static ryde height that's stored in the computer's control parameters so that the system will adjust the bag's air pressure to maintain that ryde height regardless of the load imposed...... :gaah:
So if you're thinking of transplanting a BRP ACS onto your ST, I'd hafta ask
WHY on earth would you want to do THAT?? :dontknow: It's not really going to achieve anything great for you; it's not even really all that great at doing what it's
meant to do on those models that have it fitted standard; it's problematic at best & quite prone to failures; many disable all the automatic bits because they never work properly anyway; and there are quite a few after market options in the way of coil/shocks &/or air-bag systems that can do the same job and more a whole lot better! I'd be looking at them before trying to retro-fit BRP's ACS! :thumbup:
Over to you! :cheers: