I have a 2000 Johnson 90 V4 with a extremely rusted steering arm. I found a suitable used replacement for the repair. I understand I have to remove the powerhead for replacement but I have puchased a manual there is nothing even mentioned of the part in the book. After looking through schematics and diagrams I can not figure out what exactly two bolts at the top are bolted into. I know there is a nut on the bottom of the shaft that I intend to cut off rather than try to break loose. What do the top 2 bolts mount into?