I am a bit confused/ suprised.
Just removed the rear ARB and found that the splines at one end are not engaging. It appears as if the end plate splines are a different size to the bar splines.

Because it has not been engaging for some time the splines on the lower side of the end plate have worn away.

Are there different size splines/end plates?

Should I replace the whole unit or just the worn end plate.??

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L reg "black and blue" phase 1 track 6

I have a GTI-6 ARB with a nearside end plate on if you need one . . . . . . . for some beer tokens obviously

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Team Peugeot Sport 308 Gti�

Black T'99 Gti - may she rest in peace - written off in a shunt on the A329m

The offside is smaller end

You should only be able to slide the bar in from the nearside when fitting. And you need to get the offside plate off first when removing it.

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Standard Black 6
Black HBSC6