Turboman said:

The motor parts manufacture and supply industry is quite complex.

Genuine suppliers may change, depending on where the manufacturer can get the part cheapest from year to year.

And sometimes Britpart may be genuine, or the only part that is available. A few years ago, I bought 4 new genuine NInety wheels from my local LR parts indie, a trusted friend for 20 years. They arrived, in blue Britpart boxes. The wheels themselves had no name on them, just the stamped numbers, like most wheel rims.
I fitted the wheels, with new mud tyres and tubes, and have had no problems with them at all.

In addition, a lot of parts may be made in the same factory, and stickered or boxed with different manufacturers logos. With something like a shock absorber, once someone has built a factory to make them, there is little commercial advantage for rivals to build their own factory. It is cheaper to simply buy the parts, and package and re-sell them as your own.
I have not looked into it, but you might find there are only one or two factories in the world that actually make shocks.

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jamesmartin said:

very true many brand names are now only badges

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