1954/5 fenders are different. Most people that do like the grille, change out the complete front sheet metal. Ironically most of the conversions that I have seen were changing out the 1954 grille and installing the 1947/53 grille.

The 1954 bed and frame is different also.

Your truck looks great and I would not do anything to it. Drive it and when the urge comes to modifying it, find another that is complete.