I got a switch for my '76 merc 7.5 and a '69 merc 9.8 at a hardware store that a lot of farmers use. It was, I believe, for a tractor or other outside farm machinery. It had a rubber cover over the switch, and fit the factory hole perfectly, and it had a very nice appearance after installation. The factory switches are pretty high and this one only cost about $12 and it was "in stock".

Just something to consider.
Later,
JBJ