You read it wrong, won't work with stock rod.
"Bolt in this windage tray to reduce oil aeration or foaming and oil sloshing in high speed cornering. Designed to fit the 160/200/212 Honda GX, Clone and Predator engines with stock and billet side covers and an ARC connecting rod. This part will NOT work in an engine using a stock connecting rod. The tray mounts in the low oil sensor location and is designed to also work along side the ARC stroker crank. Click on the video link to see the windage tray in action."