On my 2004 Adventurer 35U I replaced mine with:
Ordered from Lichtsinn Motors. Was around $47. Didn't know at the time but it came with Itasca engraved on it. Not sure if they have one with nothing engraved on it or Winnebago. There sales support should know.
Wasn't hard to install. Had to drill small hole to route the wire. I have it wired with the porch light. The hole I had to drill got me right to where the porch light switch was.
I looked at my old handle and it didn't like I could get any LEDs in it. Besides the chrome was flaking of its ends.
Why I was add it I replaced my porch light with an LED bulb. I did that with all my compartment lights as well. I did many of the inside bulbs also.
2004 Winnebago Adventurer 35U 8.1 W22 Chassis