Troublemakers was the last Western in which Bud Spencer paired with which longtime collaborator?
Troublemakers (1994 film):  It is the last pairing of Terence Hill (who also directed) and Bud Spencer. Bud Spencer: Carlo Pedersoli (31 October 1929 – 27 June 2016), professionally known as Bud Spencer, was an Italian actor, professional swimmer and water polo player.
Terence Hill