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Product Description
This is a dash vent gauge pod for an R53 (and R50?) Cooper S It works by replacing the factory gibmble mechanism within the vent housing. This does require deconstructing the factory gimble housing, but then this drops in and you can install a 52mm gauge. a sort-of install guide can be found here: https://imgur.com/a/Wk9B0
UPDATE!: The medium size is the original, sized to fit 52mm gauge bodies with a 63mm bezel.
The new "small" size should still fit 52mm gauge bodies, but now has been sized to fit 57mm OD gauge bezels.