That's correct. The kit removes the return pump and routes oil from the sump screen directly to the feed pump. To restore it, you need the complete original return pump and separator plate, both oil lines, and all necessary fittings.
I checked the factory service manual and called a couple Yamaha dealer part departments and neither them nor can find any info on the return pump or related parts. You guys wouldn't happen to know of any part numbers to the return pump or separater plate would you?