cheeze1 - Got my special mirror from a place here in Omaha called "Jones Automotive". They have a website. Was not cheap, I believe around $350 installed. You can find some that work the same in the JC Whitney catalog (item # MK278981) for around $229.99 plus labor. On our unit, the mirror actually works as we have a glass in our rear door so I can see rearward.
As to the plumbing vent caps, I think mine is just a hood. I was also thinking of the directional swivel type. At one RV show they had a special for like $10 /each.