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air cooling, water cooling
All 356, 912 (65-69) Generator nut, pulley side. (On late 912 models with larger 420W generator also used for the impeller side)
356 A/B/C, 912 (65-69) Air guide housing upper part, for old exhaust system.
912 (69) Impeller for generator 420 W, 28 blades. (Can also be used on earlier 912/356 models).