Wayne, i looked through my stuff again, all i have is 8x40 (new Yamiya) and one early 8x50. Thought i had one, but....... i do not.
I thought i had the 90152-300-010 Bolt A Engine Hanger, but the bolt i have is the shorter, upper rear.
The 90152-300-010 Bolt A Engine Hanger is called for all models, 69-76. Not aware of any physical appearance changes, the head is plain. I'd suggest diligent watch of ebay, should be able to find the 90152-300-010 Bolt A Engine Hanger on ebay. Cannot imagine this bolt would be difficult to find.
Sorry i cannot be of any help