Not sure what you have nor what you need exactly -- but look on marketplace or CL for someone parting one out nearby. These trucks were very commonly found with PS.
If you find a parts model like yours then check the rag joint and intermediate shaft... get if not compatible with yours. Make sure to get the PS gear (take pitman arm just in case...), PS pump, all the brackets with the pump. Check the other brackets and make sure the are compatible... Some of these trucks came with 2 or 3 groove belt systems, you may need a new pulley or brackets for your alt or balancer -- all in all give a visual to the whole system and make sure it will erector-set together. Then buy new hoses and belts & you're off to the races.