A seat I bought new, and installed for a few weeks, but is now not needed. It has barely been used, barely been outside. Sitting in garage for a year.

These are on Ebay for $70 new plus post from Qld.  The floppy ones are cheaper but are absolute garbage and uncomfortable, the kids will not sit on them. The plastic stiff ones are complete junk and dangerous in our sun.

These are made old-school with rubber and full metal inside right across . They are durable.

The side clasps are missing but easy to make. 

The post is $23 as aust post has just put the rate up and ebay charges 15% on postage !!!!!!!! (yes a complete ripoff)

These are for youth's/children's arses, an adult will find them just a bit too narrow.

Size 448 x 178 x 26 weight 2.8kg