The Dexter Nev-R-Adjust Electric Trailer Brake Kit # 23-468-469 for 3,500 lb axles has 10" diameter x 2-1/4" wide dimensions while the Dexter Electric Trailer Brake Kit # K23-472-473-00 for 3,000 lb axles has 10" diameter x 1-1/2" wide dimensions.
Since the dimensions are different you will need to stick with the ones rated for a 3,000 lb axle # K23-472-473-00. view full answer...