Yes, I've been having a good look around and the manufacturers appear to only offer the 'standard quality' (cheap radiators) with 34mm core depth.
Hella Behr do premium variants, 40mm core depth 8MK 376 711-271 (without aux connection) and 8MK 376 711-281 (with aux connection) but I can't find them in stock anywhere.
I can't see that Nissens do a thicker one.
Valeo do but it's out of stock everywhere.
Mahle's offerings are 34mm. Their website doesn't offer the premium line option.
AVA Cooling used to do AI2038 and AI2040 premium offerings with 42mm core depth which - according to their website - have become obsolete and replaced with AIA2038 and AIA2040, both 34mm core.
I'm going to make some further enquiries next week. It's an issue as I cant see the thinner rads providing the same cooling ability. There's always the custom aluminium offering mentioned above.
I'm going to try the longer 10v hose, 034121101. Just got to source one first! Not so straightforward.
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