360 Rear ARB Bush Inner Diameter

I've been away a while. Can someone confirm the correct ID for the rear ARB bush on the non-splined side ? I bought a non-OEM replacement from a UK-based performance Ferrari parts specialist and it was too big. I let them know and they were confused but super helpful and immediately sent me a replacement no question. The replacement is still too big. Exactly the same as the first one.

The original bush from my car - a 2000 with over 80k miles - measures just under 26mm. The brand new replacement is almost 27mm. The original still fits "OK" but is obviously worn. The new ones rattle around with about a millimetre of clearance.

I let them know about this two days ago and have not had a response yet...


Top: original
Bottom right: first attempt, fitted & driven about 15 miles
Bottom left: second attempt, not been fitted


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Anyone ?

Superformance are telling me they've checked with other customers who have bought these ~27mm bushes and they’ve all confirmed no issues.