Has noting to do with crossmember. Those part numbers reflect variations between long and short arm suspension. Basically if you get the catalytic convertor skid or not.But ya do??
stock part number--RFPRH6003
http://www.4wd.com/Armor-Protection....aspx?t_c=79&t_s=467&t_pt=3545&t_pn=RFPRH6003
rubicon express one part number --RFPRH6000LA
http://www.4wd.com/Armor-Protection...spx?t_c=79&t_s=467&t_pt=3545&t_pn=RFPRH6000LA
Trans has out dated or incorrect info for years. You'd be amazed how strenuous it is for changes to take place with them.
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