You must have the old style carriage. On the older carriages the gib is totally different than the new ones. Drop me a PM and I will get you one that will work with your carriage.
I've been meaning to ask You that. When I was fooling with the thumb screw I noticed that the back of the carriage on My new lathe looks longer/deeper then the one on My deluxe. Now that I took a better look at It, the front looks a little different too.