Clutch pedal ID by year

[Princess Valiant]

So I'm putting a 75 duster together and I have what I think is a clutch pedal assembly from a 75 model year A body but I don't know what is the exact difference amongst the years. Brewers has them identified as 75/6, 74/3 and 70 to 72 but they don't point out what it is that is the exact difference.

Anyone know?

 

[Syleng1]

All I ever knew is there were 3 for 67-76 a bodies.
Light duty - /6
Std- 318
HD- 340 / 383

All has a plastic bushing, metal bushing , or bearing and mostly spring wire diameter. Larger diameter wire for HD usage. With the right parts, you can make anything you want.

 

[Inertia]

I think 70? prior had a straight brake pedal lever from pivot to pedal, as shown in this pic, the later had a twist in the lever, just behind the pedal.

http://www.brewersperformance.com/prodimages/CPK-A67-1.jpg

Like this, only non-power. IIRC !

https://th.bing.com/th/id/R.dcd3bab564943ede50f612f0b7032d21?rik=RdhmiB9WR2a8WA&riu=http%3a%2f%2fwww.2040-parts.com%2f_content%2fitems%2fimages%2f89%2f2299089%2f001.jpg&ehk=WlGncidVHsELurncScZHrPLfitwf3jmLh1VjAj960Nc%3d&risl=&pid=ImgRaw&r=0