Identify these Shocks!

Hello all:

First, let me apologize for the dark images. The bike is in the back of a storage unit and I couldn't effectively dig it out. These are shocks that were bolted on to an '88 Yamaha Radian that my dad picked up recently. As can be seen, they are in fact Kawasaki shocks, 13.5" eye to eye. I have tried searching for this particular model online (c36087sd-ee), with no success. I got myself to thinking that they might be good for my Z1, since they're the right length and the color is good, too (I have a set of old Monroe shocks, the black and yellow ones from way back, that are pretty damn stiff). Any help in identifying what bike these came off of would be greatly appreciated!

Will

I believe those came from a KZ1300

Found this image of the rear shocks on a Zephyr 550. Looks to be a match. If that's the case, can anyone say whether or not they'd be good on my Zed? Sorry if this seems to be a silly question, I just don't know that much about gas shocks.