That came from the factory with a Cat D318. Been to long since I overhauled one to say today about who has what parts. The last set of pistons and sleeves I used was TRW, but think the bearing where from elsewhere.
Looks in the parts catalog in the Library for the manual that covers your serial # range, then search on machinerytrader.com for the part numbers you find. You can also ask the Cat dealer as they sometimes have the older stock