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48 Spline Boss Kit Small Black

Product ID: EXT900S-48BLK

Slimline Boss

The all new Exmoor Trim Slimline boss is the thinnest boss on the market.

Machined from solid billet 6082 T6 aluminium and anodised in a satin black finish.

Designed & made on the edge of Exmoor specifically for ‘The Land Rover.’

Please Read: remember to remove the wheel and count the number of splines before purchasing. 

Full product description
£108.49 £90.41
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Key Facts

  • High-grade solid billet 6082 T6 aluminium
  • 35mm Thinner than our previous boss
  • Quality black satin finish
  • Available in 36 & 48 spline for all years Defenders
  • Improved driving position
  • The comprehensive fitting guide provided
  • Easy fitting
  • Please note, these boss kits are designed to work with the centre cap provided. Aftermarket horn press buttons will not work with this wheel and boss combination.


Technical Specification

Large Slimline Boss

  •  Number of Holes - 9
  • 48 Spline
  • Boss depth 21mm
  • Overall depth 41mm
  • PCD 101.6mm

Small Slimline Boss

  • Number of Holes - 6
  • 36 or 48 Spline
  • Boss depth 31mm
  • PCD 70mm



Available in either 36 or 48 spline boss.

Land Rover was very inconsistent in their use of 36 & 48 spline steering columns. We recommend removing the steering wheel and counting the splines for guaranteed fitment. The below is for guidance only:

48 spline bosses were used on Defenders from 1993- 1998 or base spec vehicles from 1998-2008 and any Defenders from 2008 onwards. 48 spline boss will NOT fit County specification and all XS specification vehicles from 1998 to 2007. Will also NOT fit earlier Defenders from launch date up to 1993 regardless of interior spec.

For all options where a 48 spline boss will not fit purchase our 36 spline boss

As well as early models the 48 Spline Boss will also universally fit all post 2015 Defender. The boss has been cleverly designed with a slot to accommodate the revised indicator cancellation set up.