wanted 20x20 roho cover, pump, or to trade for smaller roho

Hi all I recently acquired a one compartment high profile 20x20 roho cushion. It had no cover, so I'm looking to purchase a cover and hand pump for it. I'm also interested in trading it for a smaller roho if anyone needs a larger one. My plan is to use it on my power chair, which currently has a captains seat which is I believe 18x18. I'm going to remove the seat and replace it with a piece of plywood to put the roho on top. My manual is 15x16, so anything sized between 15x16 and 20x20 I'd be interested in trading. Otherwise I want to purchase a cover and I'll just set it up so the excess cushion is under the armrests and maybe under (or even sticking out behind a bit) the back rest. I also may be interested in both options, for example purchasing a cover for now and if some time down the line someone wants to trade I'd still be interested, can always make the plywood base smaller. 

So if you've got a 20x20 high profile roho cover, or a roho hand pump please let me know what you want for it. If you have a smaller roho and want a bigger one, let me know as well and we can discuss a trade! Thanks.