the tamiya and HPI/hot bodies bladders are both bigger than the xray. Unless you want to bugger around trimming bladders best to just order a few sets of rcmarket or rcmushroom cheap and just replace them when they expand.
Trust me, I have tried all of these in search of a decent replacement and none fit as well as the original xray bladders.
I am running the alu shocks ATM and they are massive improvement over the original composite shocks. much easier to build and the bladders dont seem to be as much of an issue in them compared to the composites.
Only the tamiya TRF shocks are as good as the xray alu shocks, but the optional larger diameter pistons of the xrays suit bumpy tracks.