Part appears to be used.  See photos for detail and condition.

Substitutes:
J&N 300-52002-10
Denso 028200-2800

References:
J&N 300-52002-10
Denso 028200-2800
Description: Armature
OEM(s): Caterpillar, Denso, Isuzu
Voltage: 12
Condition:
Rotation: CW/CCW
Body OD: 2.547in / 64.7mm
CE OD: 0.591in / 15mm
Length: 8.307in / 211mm
CE to Bearing/Bushing Stop: 1.429in / 36.3mm
Number of Comm Bars: 23
Lam Stack Thickness: 2.909in / 73.9mm
Number of Splines: 18
Splines Type: Straight
Notes:
  • Spline on CE
  • Anti-Commutator End of Shaft Measures 10mm in Diameter & 8.9mm from Bearing Stop to End
Application: Denso 3.5kw Starters on Cummins, Isuzu & Caterpillar Applications