This is an Lincoln OEM Heat Sink & Diode Assembly (flashing diode). Fits the following machines:

Classic 300D (Kubota), machine codes: 11112, 11113, 11243, 11244, 11413, 11414, 11474, 11475, 11499, 11500, 11547, 11642, 11643
Classic 300D (Kubota, WFM), machine code: 11548
Classic 300D (Perkins), machine codes: 10545, 10546, 10911, 10927, 11110, 11248, 11280, 11411, 11472, 11545, 11572, 11573, 11640, 11641, 10657, 10658
Classic 300D WFM (Perkins), machine codes: 11111, 11249, 11281, 11412, 11473, 11546
SA-250 (Perkins), machine codes: 10890
Classic II, machine codes: 9805 to 10910