I have a Briggs and Stratton ohv 8hp i/c Intek engine. These engines are well known for the valve seat falls out on exhaust side of the head, which results in a bent push rod. The engine info is; model 202412 type 0145e1. The push rod part number is 592673. The problem is the original push rod is longer than the replacement. I tried buying another one from a different shop, but i got the same thing smaller than the original. Anyone has information why the replacement push rod is smaller?