tool to adjust rear shocks

hope this isnt a stupid question, but where would i pick up the rear shock adjustment tool? also, the damper adjustment on one of my rear shocks seems to not line up to the numbers thats you can click through - whats the best way to re-align that?

thanks! i really appreciate everyone's help

-bj
1980 kz750h

The rear shock tool is just a spanner wrench.

i wrap mine with a shop towel and use a big pair of channel locks.