Where to get a gear drive conversion kit?

So I have a gx390 with a direct drive 4x4 and I want to get the gear drive kit so the pump doesn’t get too hot from being run. Can anyone add a link of one they would recommend? The next machine will be a belt drive but i still want to get the most out of this one.

Russ Johnson, Southside Equipment. HP5535UR.

Instructions on how to swap it in this thread:

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