Cant find gearcase head for 7.5 Johnson outboard

[lesles]

I have searched every web site I couldn find for a gearcase head part number 434294 or 393747 or 389575. It is for a 1981 7.5hp model j8rc1c Johnson outboard. Evinrude wont sell the part except with the entire lower unit for about $950. Anybody know where one can be found?