My June 1970 Barracuda the LH door window slide is 70 style the RH door has door glass slide thats the newer '71-4 style.

Also the rear brake hose was the '71 style setup.

Looking at the exterior of this early 70 ebody, at the bottom at the e-brake cable area, you see two large holes - one where cable enters. My car is the newer '71 style panel only has one hole for cable, and the firewall has one hole that usually don't see on other70 ebodys.