From what my mechanic told me, yes.sdabel said:Is it just the front suspension spheres that get the triple membranes?
The reason is that these spheres are much more resistant to heat, as there is at the top of the engine compartment.
He also said that they had used these spheres in Africa for 20 years, because it gets so hot there that the black rubbery membranes, 'urepan' ?, were turning to goo in the heat.
The rear spheres are living in the shade and breeze under the car, where it's a lot cooler.
He showed me a black rubbery membrane that had turned to goo when new from the box, never used.
Since he still had it, it meant that the supplier didn't question it, and didn't need it back.
From my dealings in spare parts, that's a sure sign that the occurrence is quite common.
As for why your XM UK S2 doesn't have the dimpled spheres, possibly that some vintages sold in temperate countries came like that, or that they got replaced since.
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