OEM Replacement Parts
These parts are often hard to find. Not available on Amazon, otherwise I'd have them listed in our affiliate store.
Acquire these online through a reputable dealer of the product:
The original wipers on the R27-OB are Marico Polymer, 14". Part number: 31114A. However, that doesn't appear to be available anymore. 31014A looks like the suitable replacement.
Webasto Diesel Heater (Airtop 2000 STC) fuel filter
The Part number is 50487171A.