I recently did the timing chain job on my 05 STS 3.6L and the kit did not come with a guide for the oil pump. I was unable to find the guide in stock anywhere separately but was able to find that there is a new Melling oil pump that comes with the guide that fits the LY7 motor. Figured I would share as it might come in handy for someone in the future.

Part number is M353 and the info sheet is below: