I believe that's a noise suppressor, look at this page
https://www.jimellismazdaparts.com/showAssembly.aspx?ukey_product=1813760&ukey_assembly=313649&ukey_make=995&ukey_model=14351&ukey_driveline=0&ukey_trimlevel=0&modelYear=0
I bought a universal condenser from a shop that sold parts for old VWs and used that on my B2200. Did that make a difference - don't know. And I'm not sure I've pulled a decent one from a "yard" B-truck, can't remember. Oftentimes the wire breaks off as these get old/hot.