QualityParts From Oregon That you can depend on. Spindle assembly: Outer diameter: 7"; Fits 28"-52" and 46"-52" rail frames; Fits GT rail frame tractors; Use with OregonĀ® 45-243 upper bearing and 45-242 lower bearing and 45-250 bearing kit; Zerk fitting; Oregon Equipment Parts 82-243 Spindle Assy Murray[822]