So I need to replace a hydro pump on a ZTR. I know the pump is bad because after doing all the usual stuff, changing fluid, bleeding air out, checking belt and adjustments I still have far less power on right side. I even swapped wheel motors and the problem stayed on the right side, meaning (to me) both wheel motors are fine and it is the right side pump. Question is, when I look at J-thomas for example I see a listing under the mower parts for hydro pump for like $470 with the j-thomas part number and corresponding OEM number. However looking at the pumps I can see that they are Hydro Gear BDP-10L-119 pumps. On a different page in J-thomas they list new pumps by these numbers and it is $450. Now I don't care about $20 so which should I buy?