Looking For Steering Box

Manual steering wasn't that common on A bodies from '73-'76. The diameter of the sector shaft changed in 1973 so you will have to find the right year box or swap box, centerlink, pitman arm, and idler arm to use a '67-'72 steering box. It's not all gloom and doom since B bodies used the same steering box (large sector) from about '68 on. Finding a '73-'76 manual steering pitman arm is not so easy though. Hope your Duster already has one. IMHO your best move is to call Firm Feel or another vendor and order the box you need. That way you have a new box with the ratio you want, a warranty, and not a lot more money. By the time you find a used one, clean it up, replace the seals, and pay for shipping, you will be lucky if you have less than $200 in it, and it will still be a used box. Just my $.02.