I will do when I can on Monday. If all aftermarket though are £125 upwards I’d be surprised if they aren’t at least double. As a comparison I have got TRW front arms for £117 each and MB wanted over £350 each.
I would always get a quote from an MB parts dept. first - there are certainly some parts that are shockingly expensive, but equally there are many that aren't. Nothing to lose by asking.