Here is a comparison of the 04 and earlier gauges and the 05 and later gauges:
The later gauges are much smarter looking and of course much more modern-looking. Both seem to be the same general shape. I believe in the later models the 04 < left side computer now becomes the center part of the main gauges and something else is there, I'm not sure what. Somebody with a later model LT should be able to tell me
I wouldn't think you could swap them due to completely different set ups. The '04 and older are completely "analog" in their function, with no digital gauges or read outs other than the gear select. The '05 and newer have only the speedo and tach as "analog" and a digital screen for various bits of information. Pretty sure the wiring harness wouldn't match up either.
This is just educated guessing though.
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