how would you get the two opposing plates even close to being able to put the bolt through?
OP: what springs are those? they look like short no name superlift or something 79-85 springs..
x2 on fixing that motor mount
If both the center hole distance is the same (like 6") the bolt will go through and the shackle will work the same as any shackle.
It doesn't matter the shape of the shackle. The spring is in a fixed location set by the hanger. The shackle just allows the sprin to extend. Doesn't matter if it's straight, a L, a z or a J, the shackle works the same