Re: Unknown Mercury
No 9.8 engine that I found in the parts book had those numbers. However the 75 (7.5HP) does. The 46172 is the part number for the exhaust manifold cover. The 837-5284 is the part number for the block (7.5). I did not look at all the year models due to time, but a 1974 model 75 had both of those numbers.