Yes, the 54 one is maybe even more "advanced" than the Classic Parts one. The "modern" Lisle one is better looking. Post a link to a photo of the 55-59 one (or mail a photo to me). We might as well see the GMC tool.
By the way, I'll get good use out of mine - I'll use it twice in one year (and then lose it again, I suppose).
Thanks,
