Ok, so am I correct that the seatpost on my Spaceliner is 3/4"? If so, what is a modern replacement? I would maybe like a set back seatpost but none of the seatposts, all in mm, seem to be equivalent. Any help? Ideas? The top of the current post is very narrow and needs a very small clamp, and the old clamp won't fit more modern saddles. Thanks in advance.