This is the latest version with a raised ridge halfway along the arm.

Both arms, with ridge or without ridge, are fully interchangeable.

Replacement plastic housing from a pair of GHD 4.2Bs. This is the non switch side arm in a matt black colour.

Please note that there are a number of different variations of 4.2B case so you need to check compatibility carefully.

This is a type 2 arm design as shown on the 4.2B page.

This part is a 2nd hand and has been removed from a broken pair of GHDs.