R51/2 used a rear fnder with a 5 lip hinge and welded cover piece for the driveshaft.

R51/3 from VIN 522 001 to 536 001 

R67 all

R67/2 from VIN 612 001 to 615 547 

R68 from VIN 650 001 to 651 304

On these  motorcycles, 3 versions of rear fenders can be found:

5 lip hinge with welded cover piece for driveshaft - from 07 Jul 1950

- 3 lip hinge with welded cover piece for driveshaft - from 25 Jun 1951

- 5 lip hinge with bolted cover piece for driveshaft - from 28 Aug 1951

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R51/3 from VIN 536 001 

R67/2 from VIN 615 647 

R67/3 all

R68 from VIN 651 304

These motorcycles had a 3 lip hinge with bolted cover piece for driveshaft (from 11 Dec 1953).

An exception may be some R51/3 motorcycles that have been fitted with a 5 lip hinge with bolted cover piece for driveshaft.