Mattress corner detail for 32 x 74 twin mattress

[Silverexpress]

We have a 27A Safari with the twin beds in back. We plan on replacing them with better quality mattresses. Airstream only has on file the schematics for the classic twins which are wider, 34 x 74. If anyone has the Airstream corner radius detail for the 32 x 74 mattress please let me know.

[Pahaska]

When I converted my crosswise queen bed into twins, I made a template out of kraft paper and sent it to the mattress maker. The resulting matresses fit great.

[Silverexpress]

I did pretty much the same thing using plastic and a marker. Will send it off and see what happens. Thanks for your response.