I haven't tried the Beetle, but I'm a little wary of the B68 recommendation only because I tried a B72 (which has the same dimensions) on my road bike. Unless you sit very upright, it may be the wrong shape (or too much the wrong shape). I couldn't get back far enough on it and it chafed. I do have some saddle to bar drop, though. So, if you don't, it may be worth a try.

I ended up with a B17 and am happy so far.