i have a 51 3100 myself. i have taken the 216 out and put 235 in.while chroming up the motor i could not find anything in the old truck books so i went to napa and got a chrome dipstick and tube,package,pulled the tube out and put the knew one in.measured the old stick and marked the knew one. put same gasket sealer on tube and it is in there. hope this helps. i do have the tube and stick from the 235 that you could have if you dont like the napa idea
