Ron and others

I am looking for "slip on" type EZ cover for my Vanagon's rear sofabed seat.

The Bus Depot has 1968-1991 cover for sofabed but only if its a 1980-91 Vanagon with sink  (pg.41, old catalog).  

I'm the 1/2 camper without kitchen.

Please advise as to my options.

Thanks

Larry
Georgia