DA is Durkopp Adler America. They are in Georgia. You can call and order parts from them via a credit card. You must have part numbers available for them. You want to talk to Denise in parts. I think it is ext. #3.
I think you will need to order the the bushing part # 167-00-067-0, stitch length plate cover #068-16-047-0, and another tension assembly for the other needle thread. You want to find parts list for a 167-273. Superior Sewing and College sewing have the parts list for Adler 167-372,373 single needle and that will work.
glenn