Who made these lift coils?

[Demonoid369]

Awhile back I picked up a pair of 3.5" coils from a buddy but he wasn't sure who made them. Fast forwards to last week and I bought a pair of coils at the junk yard for a killer price. Now comparing the coils to the ones I had before, they appear to be of the same size coils, and height so I'm assuming these junk yard coils are 3.5" but don't know who made them either.

Wanted to ask you guys who made these?

The hammered looking silver ones I got from my buddy and the smooth silver are from the junk yard.
Looking around, I've read that the rubicon express coils have a textured silver paint? And that seems to fit the coils from my buddy.

Anyone have a definite answer as to who made these coils? Would greatly appreciate it

 

[markw]

Silver coils are usually Rubicon Express.

 

[Papercut]

A lot of companies make their coils in gray. Would be hard to say for sure who made them with out a part number.

 

[Ian Christiansen]

The coil on the left is progressive rate because of the tighter spacing at the bottom so that might narrow it down.