Replacement parts for my autosleeper

Have you tried AutoSleeper?

Here's a link to their spares list:

https://orbit.brightbox.com/v1/acc-jqzwj/Auto-Sleepers/asset_management/assets/assets/000/000/387/original/SALE_BROCHURE_SEPTEMBER_2020.pdf?1599467930

but be aware they may not necessarily still have stock of the part you need however at least this will help you identify which of the many variations you have.

Or just give them a ring. It'll help if you quote the original Job Number for your particular van, which should be on a label probably in your glove box.

If AutoSleepers don't have any then the pic from the list may help with a Google image search for another supplier.

Or else post  a pic on here, someone else may have found a source.