THE HEAD DOMES AND CONNECTING ROD LENGTHS ARE WHAT WE ARE TRYING TO IDENTIFY AND GIVE NAMES TO HERE "MODEL"____________________"WE WILL CALL IT" Z50 68 TO 81_____ (OLD_50_DOME) (SHORT_ROD) * Z50 82 TO 87____ (NEW_50_DOME)(LONG_ROD) * Z50 88 TO 91____ (NEW_50_DOME)(LONG_ROD) * Z50 92 TO 99___ (NEW_50_DOME)(LONG_ROD) * XR50 ALL______ (NEW_50_DOME)(LONG_ROD) * ZB50________ (NEW_50_DOME)(LONG_ROD) * CRF50 ALL ____ (NEW_50_DOME)(LONG_ROD) * PASSPORT 80-81__ (OLD_70_DOME)(SHORT_ROD) * PASSPORT 82-83____ (NEW_70_DOME)(LONG_ROD) * CL70 ALL_______ (OLD_70_DOME)(SHORT_ROD) * CT70 69-81_____ (OLD_70_DOME)(SHORT_ROD) * CT70 82_________ (NEW_70_DOME)(LONG_ROD) * CT70 91-94______ (NEW_70_DOME)(LONG_ROD) * SL/XL70 ALL___ (OLD_70_DOME)(SHORT_ROD) * XR70 ALL________ (NEW_70_DOME)(LONG_ROD) * ATC70 73-81____ (OLD_70_DOME)(SHORT_ROD) * ATC70 82-85____ (OLD_70_DOME)(SHORT_ROD) * TRX70 ALL_____ (OLD_70_DOME)(SHORT_ROD) * TRX90 ALL (NEW_70_DOME) ROD IS DIFFERENT THAN ALL OTHERS * OUR 100003 HEAD____ (OLD_50_DOME) * OUR 100004 HEAD____ (OLD_50_DOME) * OUR 100001 HEAD___ (OLD_70_DOME) * OUR 100002 HEAD___ (OLD_70_DOME) * OUR 100006 ULTRAHEAD__ (OLD_70_DOME) * OUR OLD STYLE ULTRA HEAD _ (OLD_70_DOME)