He will also need the lead sealing washer that goes in the coller neck.Drake also has these! ken ct.The tank Bob Drake sells for a '35 is actually a'36 tank. He sells an adaptor ring that will let you use your'35 hydrostatic sending unit. If you went in this direction you would need to plug/block off the threaded gas line connection on the front wall of Drakes tank. If you went with the 36 sending unit you would also need to use a vented filler neck like the 36 uses.