firestone compressor specs?

aight i picked up some firestone compressors and have been searching the net and cannot come up with anything about them. they say model number 21-3582-9014 firestone air springs load leveling.

dude i got them from said they came with a air ride technologies kit a while back. i cant find a damn thing!

they come with the helper bag setups there small or at least all the ones i have seen are maybe firestones website can help