Yup, they can be a pain and you can tell them from the real thing... that said... I've got them on my '68 and they look pretty nice. Check out the pics on my webpage.
To get them on easily, you need to pre-stretch them... for the larger diameter radiator hoses, I used a broom handle to stretch them out... once stretched, it is pretty easy to get them on the hoses.
Oh yes, the kit I used was from Summit... about $35 if I remember.
- '68 Chevy Camaro (sort of done, but always subject to improvement)
- '63 Pontiac Tempest (work in progress)
- '72 Datsun 240-Z (back-burner for now)