Longest seatpost shim?

I need a 27.2mm to 30.9mm shim so I can use a 27.2 mm Gravity Dropper in a Spesh frame.
I want the shim to be as long as possible, who makes the longest?

Saturday morning bump.

USE are a good length, dunno if they’re the longest.

My USE shim is a fairly decent length. I’m not sure how it stacks up to other shims though, as I’ve only ever used USE ones.

The gravity dropper one is 100mm long.

My USE plastic 27.2-30.9 is 90mm (inserted bit). If you need more you could always cut the top off another and use both on the post. Would maybe mean fishing out the lower one with an old spoke when you remove the post but do-able.