vintage shock ID help please
 

I have a new pair of Rocket racing shocks 50/50 and have no Idea what they fit. They have no numbers stamped in them. I assume they are rears.
From the center of the rear tiebar to the bottom of the washer stud mount they are 9 inches closed and 12.75 inches open. Any idea what uses this size shock?

https://i.postimg.cc/Ls2XNmHj/20190521-204320.jpg

https://i.postimg.cc/nzLLfT9z/20190521-204324.jpg

Thanks
Scott