Here is the tapetype I got for my HP SorageWorks 960 Ultrium 3 unit. Hopefully it will help others.
define tapetype unknown-tapetype { comment "just produced by tapetype prog (hardware compression off)" length 386048 mbytes filemark 0 kbytes speed 49993 kps } -- U.S. Encouraged by Vietnam Vote - Officials Cite 83% Turnout Despite Vietcong Terror - New York Times 9/3/1967