1976 Dart Lite is a pretty rare car now...
The clutch parts from any 1973-1976 A-body and 1976-1978ish F-body should be the same. If someone 'Frankenstein'-ed together parts from a truck or B-body, etc you might have a handful.
Here's a top pic of my 1976 Feather Duster linkage, I can't find the 'underside' pics from when I rebuilt it and I just took these pics 5 minutes ago in the rain...
The bellhousings and bearing arms from the 60's to late 70's should be clip type:
Many of the trucks in the 80's I have seen get this 'ballstud' type of arm:
Here is a comparison of the two arms, the top is the ballstud type and the bottom is the clip type, they are similar in size, there is a difference in the adjusting rod attached to the arm. The 'truck' arm at top has a shorter eye-bolt and my Duster used the 7" not the 5" model shown.
My thought is someone in the past couldn't get another arm after they 'cracked' the OEM one in half (happens way too often...), so they got a bellhousing and setup from a later truck and swapped it in...so you need to call Year One or talk to your local auto parts guy and get a 7" Fork Rod for your A-body, and a Z-bar kit to replace any worn out bushings,etc...(good insurance...)
You can pull the arm right out the side if needed without pulling the tranny.
good luck,
-D.Idiot