Fleet Charge is available from most HD truck distributors like Freightliner, Kenworth, Wester Star, Peterbilt, Volvo, and International. You can also find Fleetguard ES Compleat from these same locations. Detroit Diesel distributors sell DD Power Cool additives and Power Cool Antifreeze (Fleet Charge). You can also get precharged coolant from your CaseIH dealer under their own brand label. Deere sells their own nitrite-free OAT but may have a precharged conventional coolant but not likely Fleetguard as Deere is only interested in selling their own private label coolants as they do make their own. Same story for Fleetguard and some other brands of filters like Baldwin or WIX. Many of these same dealers sell more than one brand of filters.
I see that NAPA is listed frequently. NAPA is actually more expensive but their selling point is they may have a wider selection on some equipment and may also deliver. NAPA filter products are manufactured by WIX as are Big A and CarQuest.
Great info but again in many Kubotas using a SCA or pre-charged coolant is not needed. As far as Carquest, I do not shop there, it is junk.