Lester Called the Earliest 60A Version of the 14255 the 14577 (OEM No. LR160-46 - 204-121B). Later Styles, Which Were More Popular, Were Given the Part Number 14301 (OEM No. LR160-74 - 204-121 and LR160-61 - 204-121A). CPC Catalog Users Stayed With the 14577 as Their Number. To Merge the Two Together, We are Superseding the 14577 Into the 14301. This is the 60A Version of the 50A 14255. The Larger Case Version of the 14301 is the 14303.