S.A.500.C. Handle Bar Assy 

The Grips can be bought as a replica.
519 Grip, LH has an inner diameter of 1” because of the twist grip.
574 Grip, RH has an inner diameter of 7/8” .
Both grips are 4” long and are of the OBE (Open Both Ends) type. 

The grips can be ordered at http://www.dialpatterns.co.uk/grippics1.html under #4 OBE at: 

Dial Pattern Ltd.(incorporated Vintage Grips)
Specialist Engineering Pattern & Model makers
Suppliers of quality ferrous and non-ferrous castings
Manor Farm Workshops
Hornash Lane
Shadoxhurst
Ashford
Kent TN26 1NW
United Kingdom
Tel.:  +44 (0)1233 733234
Fax.: +44 (0)1233 733038
http://www.dialpatterns.co.uk/
sales@dialpatterns.co.uk

 

560-Plate, Manual Brake is shown with a quantity of 2 on the parts list.
The RH one is for the Manual Brake indeed, the LH one is for the cable of the Friction Control. So there’s not just one Part Number, but also one description for the same item with different functions.