WTB: rail type seatpost 200mm or so?

If anyone has a rail type 25.4mm diameter seatpost lying around please let me know. here’s the story:

I use a modified velo style seat with my GB4 handles on my 29er with a standard seatpost and it worked fair. The handles were a bit loose but not enough to be a bother. When I got my 36 nimbus DX I saw that the seatpost came with a rail type and an adapter for the KH style mounts. I threw the GB4 assembly on that to find that the brake mount on the KH converter braces the handles where a screw is “missing” and works out very nicely. I want to get another rail seatpost for my 29 when my T7 handles come in for my 36 so I can have two working touring unicycles in the event one of our more recreational teammates decides to ride a tour with us but doesnt want to buy a big dollar item to ride it on.

If you just want a regular bike-style seatpost, just check your lbs (local bike shop). They should have an abundance at prices ranging from practically nothing up to hundreds of dollars. Or check your local craigslist.