The drain plug requires a 17mm allen wrench that you can get from Sears or
NAPA.

The filler plug needs the same tool and it is located on the rt side of the
transmission, a little forward of the drive shaft and a little higher.
You will need to do some acrobatics with the wrench handle pointing upwards
to get it loose but its not really that hard , unless someone overtightened
it.
The thread is tapered so the looser it gets, the easier it comes out.

Steve Cotsford
'84 Westy