I've got a 1962 Evinrude Lark 40HP thats in need of a starter solenoid. After finding the part # here on iboats (Sierra 18-5807) I did a search for that part # and found several different prices with the same part #... What gives? The cheapest one lists for $17.99 but is listed for an OMC, the one for my Evinrude is $$35.99!!! If its the same part #, and hence the same part, why the difference in price?