I own a Louisiana K24 which is the same as a Pit Boss K24 and was searching for a rotisserie. Unfortunately as we all know there isn't one available here in the states. I found a kamado manufacturer in China who also makes different size rotisseries. I took a chance and ordered a 23.5" rotisserie from them and it fit!
I gave it a test run today cooking a duck and it came out ridiculously good!
Now for my criticism. It's constructed out of very thin steel which I can imagine will rust away if left out in the elements. The fitment isn't a perfect seal but I did the test run without adding any felt gasket and it held temp. Finally the spit rod can get hung up a little by the turning, probably needs a good break in and it shouldn't be an issue anymore.
For anyone interested, the company that manufactures this is Fujian Auplex Kamado Grill Co., Ltd.
I found them on Alibaba.