Where to get a front pump for a 42RH (A500)

The early pumps had a whine, so they increased the size of the take up ports in 1995. But the valve body port had to match the bigger pump port, so both the pump and the valve body changed.

There are also two different oil pump gear types, the older slotted drive, and the newer flat slot drive.

I think the 42RE uses the later pump with flat gear drive. So if you've got a later 42RH that has the bigger inlet port, you could probably use the 42RE pump, just get the correct gear for the type of torque converter drive you have (slotted or flat).

Here's some pictures of the different gears and gear drives, and a TSB that shows the difference between the two oil pumps: