We are planning to order sheet sets and mattress covers from AB Lifestyles, a specialist in RV Bedding , now including Oliver Elite II.
They did a custom Oliver order last year using the the dimensions for the Oliver Elite II twin beds.
They now have bedding available online for ordering.
Both sheet sets and mattress covers are available for Oliver Elite twin mattresses.
They say on the website that each set is a PAIR for both left and right twin beds.
The PAIR includes fitted bottom and top sheets for both left and right mattresses, and 2 pillow cases (one for each bed) .
https://www.ablifestyles.net/road-ready-rv-sheet-set/
They also have mattress pads for the Oliver Twins.
This link is to their plush pad…and they also come bundled in pairs (both left and right mattress shape one package)
https://www.ablifestyles.net/products/ultima-plush-mattress-pad-for-campers-rvs.html
This link for their waterproof covers…also a PAIR.
https://www.ablifestyles.net/keep-a-bed-waterproof-mattress-cover-for-rvs-campers/
Finally, they also are a custom RV mattress company should anyone need to order those as well.