I put the drop out extensions on my Rambler Base. I couldn't be happier with them! The picture TT has of them is very inaccurate, it doesn't really show what the extensions look like, neither does it show how they work. I "took the plunge" and bought them hoping they would do what I wanted them to.
With the drop out exensions I put a 700c rim and tire on the rear. The 700c fit with roomtospare. I also have a bit more heel clearance than with the 26" tire in the stock mount position. I also have two gears "left to go" when cruising at the same spped I used to ride at. All in all, I really like the way my Rambler is set up now!