Replaced mine a few months ago. The part numbers (eg. 8L3458) are stamped on the sides of the risers. The left and right risers have different part numbers. I ordered them from my local Cat shop in West Sacramento. Cost was about $1,000 each. Don’t forget to order proper gaskets and “spray rings”. My total cost was about $4,500 for two 3208 naturals (four risers).
1986 GB-42 Classic