Difference in doors from 76-77? Help!

[Theoriginalsilverado]

Hey people!

Quick question for you- but first the backstory!

I've been considering getting new door panels for a while now. LMC has recently came out with a new line of gorgeous door panels from TMI- http://www.lmctruck.com/icatalog/cc/full.aspx?Page=70



However, they're only for '77-'87 trucks; I own a '75. These panels would go great with my interior and truck color, and I plan on getting the matching dash.
Brother also has the same panels listed in all black leather( https://www.brotherstrucks.com/73-80...tinfo/QDP0080/ ), however they claim they'll fit any truck in the '73-87 era. I've confirmed that the doors did infact change in 1977 (see here- http://www.73-87.com/7387info/7387differences.htm ) I'm guessing this is a mistake on behalf of Brother Trucks. TMI also has it listed on the site for '77-'87.

My question for anyone who may know- what exactly are the differences that will affect door panels?

Is the handle in a different position?

Are the mounting holes moved?

Is the geometry different?

If anyone has pictures or measurements of the doors from either era I'd appreciate you uploading them! I'm away from my truck at university so I'm unable to measure my own door.


If the differences are minor, I plan on purchasing the panels anyways and modifying it to fit.

Thanks in advance! Any input is greatly appreciated!

Here's the latest progress on my truck for anyone interested: