90 pickup cover

hi all, warm enough? been looking in to covers for me old ex-mod 90 pickup , had an ifor williams hard top canopy on for years ,but had lot of work needing the load bay open recently so was wondering if there is a cover for the back like i had for the nissan pickup, just a rubber like sheet with eye holes all round, has any one seen any ? got to be bout 5' x 4' i cant get one any where, cheers

have a look here.