I have a 71 Duster that has been converted to front disc brakes (5x4.5 bolt circle) and was told that it was from a 73 Duster. How can I verify this and what parts would have been changed out for the conversion (steering knuckle, control arms, brake hoses, etc)? Thanks.

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"You know a car is really yours when you've touched every fastener on it." -David Freiburger

That would make sense. The older than 73 disc were K-H 4 piston disc with the small 4" bolt pattern SBP. 73-76 A body are all pretty much interchangeable and were LBP 4.5.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

So when ordering ball joints, control arm bushings, pads, etc. I should order them for a 73 to 76 A body?

_________________
"You know a car is really yours when you've touched every fastener on it." -David Freiburger

If your stuff is from a 73 Duster, order for 73-76 A body

Your upper control arms were changed, but the upper control arm bushings are the same for all years. Upper Ball joints are larger for 73-76.

Your spindles were changed, so the lower ball joints are larger and from 73-76.

Tie rod ends are same for all A bodies, if I'm not mistaken. You can upgrade easily to the larger HD style 11/16" instead of 9/16" tie rod ends and sleeves. The part #'s are:
MOOG
ES440S SLEEVE x 2
ES352R TIE ROD x 2
ES355RL TIE ROD x 2

Lower Control arm bushings are the same all years.

Strut rod bushings: there are a few different types, I would just order for '71 since that is the K frame you have. Maybe someone else can correct me on this or any other mistake I have made here. There is a lot of information on here, so poke around. Good luck with the rebuild. I recommend RockAuto.com for parts, they have good prices.

Rotors, Pads, Calipers, hoses, are all late model 73-76 if the swap was done correctly. Ditto for the master cylinder and proportioning valve.

Thank you for pointing me in the right direction

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"You know a car is really yours when you've touched every fastener on it." -David Freiburger