I take for granted that your 02 had a 4-pin flat connection and I believe the 05 has a 7-pin round connection. Why not just buy a 7-pin round to 4-pin adaptor?... Probably wouldn't cost you more than $15 or so...

Just an example link: Hitch Wiring Adapters

EDITTED TO ADD: If I am way out in left field on this, I appologize...