OK I found it
Arm, Steering Gear
I cannot guarantee the accuracy of this info, it's only what I read in the manual.
Note initially I thought you might have a hard time finding this but they are on eBay aplenty and may have been used thru 1993, you may be able to buy one from Ma?
I earned my title by questioning a members declaration that he was dating a 17 year old when he was 28. Yes he would not like the outcome of his visit to my house to pick up my 17 year old daughter!