Were to find a 26" extended, double adj shock.

I did some searches that way, but couldn't figure out if the bolt size was the same let alone if the width of the rubber, was right to fit it.
Did you have any issues with this?
Also if you don't mind me asking, what of the 10 positions work best for you.
Also what was the full extend length of them shock.

When searching for cars shocks they were all in the 21" range. when i went searching for truck shock. they were listed to fit w/ model and year of truck but never showed length.

I can't afford the santuff or a like stuff, but would like to have a stiffer shock on the back that has some adj in it. But, i don't need a shock that is to short, beating it self to death also......or to long for that matter.