master cylinder sleeve kits

Looking at sleeving down master cylinder I have a mk3 are the kits advertised suitable for front and rear master cylinder on a mk3? or only front cylinder

The kits are usually intended for the Norton front master cylinder.

The 850 Mk3 rear master cylinder is the 'Triumph' type with the screw-in cylinder and these are available in 13mm bore size.

https://andover-norton.co.uk/en/shop-details/16969