From M-parts Website;-
" The Real genuine Rubber Cone Spring, made correctly from Rovers only Original Tooling for the assembly line - despite other claims. These are the only product available with correct ride height, bonding to metal,threaded top cup and metal ring - made in the UK.
Beware of all copies and old stock being offered anywhere for sale especially on ebay and websites.
Genuine cones are precisely manufactured to certain technical specifications with the patent number stamped in the rubber - 763432 - no number - not genuine "
1st - With the type on inner plate used in the Mini Sport ones, which are flat both side and that has an effect on the Characteristics - how can it be genuine ?
2nd - Avon never made them as an OEM supply to BMC/ Leland or Rover, granted, those made by M-parts aren't made under a Dunlop roof either.
3rd - On test, the Avon branded cones are nothing like the original Dunlop types, however, the M-parts ones are near identical.
4th - The company offering the Avon Cones have a very very poor reputation - if they said the sky was blue, you'd go outside to check. M-parts and Mini Spares stand by the products they sell and frankly are very trustworthy.