Don't know how to tell the year of the clip, but you can buy the Kanter parts individually, you don't have to buy everything in the kit if you don't need it.
And if its working great, it doesn't really sound like you need anything anyways.
Cheers


1946 Chevy 1/2-Ton
In the Stovebolt Gallery
More pix on Photobucket

Sometimes I forget where I left myself....