Used True 450 500 Front Wheels with  3/8" bolts  Factory Original Good Used condition See Photos for fit. Includes 2  3/8" shoulder bolts, nuts Item Removed from True 450 Treadmill These fit 3/8" holes for the later black faceplate models, They will usually not fit the earlier Smaller  5/16" holes the later black faceplate models usually had. (see 2nd to Last photo) Last photo shows later version machine removed from (treadmill not included) (If you are a treadmill service tech and/or mechanically able you can use these in place of the the smaller older 5/16" size by boring the hole with 5/16 drill and running a 3/8"-16 tap to make this larger stronger size fit.)