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@Rik Perry tesywd them and found a marginal difference.
I personally have always worked in pairs left and right when needed.
just checking you know that trophy oem rears are simply 182 cup/cup packed springs... and pretty easy to find s/h. Obviously brand new...
Yeh Bosch S4 has been great for me too. Eurocarparts have an offer on (use promo code SALE50) so theyre £65!