first off...do you have double or single unit? if only a single you can use fleece on the ramps. I went to walmart and got 2 big cheapo towels and cut them in half and i use that on the two smaller shelves with absorbent pads beneath as I have a double. can keep them on with binder clips
if you have a double and want a cover for the top pan though here is the link. you want to get 2 though so when you wash one you have a clean one to replace it
https://www.amazon.com/gp/product/B00BS98Q44/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
ramps
https://www.amazon.com/gp/product/B00CMH9KQE/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1