I found out their fender adapter kit LANMF24544 does not fit the 4xxR sprayers like the website says.  It only fits the older large frame 4 series sprayers like the R4045 and the 6xxR sprayers.  So, I assume their fender lift kit LANMF24542 bracket won't fit a 4xxR sprayer either.

Fender adapter kit for John Deere® 4xxR & 6xxR sprayers