I am looking to replace the hydraulic valves on my 441. I have parts numbers but they no longer make them. I am looking for something that will interchange will with the parts listed. Any help would be appreciated. 1. 170-33281 two spool control valve 2. 170-33433 one spool control (auxiliary) valve Or will pretty much any two spool and auxiliary valve that will match the mounting pattern work? Recommendations? Thanks. Ferrel