Just to throw another spanner in the works, the size of the slots doesn’t mean much these days, you can find the smaller slotted bush that isn’t as good as the one with the long slots.
The reason? The shore hardness of the rubber varies between supplier, a lot of the Chinese bushes use softer rubber than the original bushes.
A good tip (Although a bit late once you have bought the bush) is that if the bush slides into the arm easily then the chances are it’s one made from an inferior rubber.
The best bushes make you swear a lot when trying to fit them!
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Lest we forget..
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