There be wiser and more reliable sources of info than I. But, call tucker and ask. I'm pretty certain though that your track assembly is much later than original equipment. They might be able to help you with that as well. Have data plate info handy when you call.
I agree with Tom that the tracks and carriers are likely from a later machine. My impression is that as Tucker transitioned from pontoons and steel tracks to rubber belts and carriers they also changed from using Dodge 1/2 ton corporate axles to Dana 60 axles. Some machines were hybrids in that they used the Dodge axles, but also carriers and belts. I think Track Addict's 1443 is one of those.
I'm reluctant to offer an opinion because I'm not sure what you have, and I hope you can understand that. Generally, having the data plate information handy when you call Tucker is helpful, but as the machine has probably been modified from its as-built configuration, they will likely need some photos and measurements to get you the right parts. I recommend you speak with Jeff Godard at Tucker. Though he works in sales, he was the parts and service manager beforehand. He is hugely knowledgeable, and very generous with his time. In short; he's a great guy!
I've never bought parts from Fall Line in Reno, however based upon recent reports from other forum members, I have enough concerns that I won't buy from them.
Welcome to the forum!!!