I do not have a part number for this part.  Here are some sizes:  Commutator - .695, winding body - 2.695, OAL - 11" approximately. 

470 (2BBL) Merc 224 I/L4; 470 MIE Merc 224 I/L4; 485 (2BBL) Merc 224 I/L4

Merc/Mariner 140 Jet, Magnum III, V-135, V-140 (International), V-150, V-175, V-200, XR-6; Race Outboard 150, 200 EFI Pro Max/ Super Mag, 2.5L EFI/EFI OffShore, 200, 225, EFI Pro Max/ Super Pro Max

80 Renault, 80 Sterndrive