I thought they listed a part number for the tool in the manual but they don't, so it is probably an off the shelf item. They show quite clearly how to use it in section 13 of the service manual. The labor cost using a chain breaker/riveter should be about 1/8 - 1/4 of what it would be to pull the swingarm and there is a lot less chance of buggaring up.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python