I have a 1997 3 cylinder 25hp that I broke the lug off on the thermostat cover that threads into the housing (I got the cover off but the lug is broke and there are a couple holes in it now that would cause water to leak). For the life of me I cannot find 0339256 OR 0436079 part numbers available anywhere. Are there any alternatives or replacements or advice? My last ditch will be JB weld the holes shut and hope for the best.....motor is a good running motor otherwise.