The problem is that the core and side pieces are not aligned correctly. This means that the top edge of the core where the tank joins hits the shroud on one corner before the bolt hole lines up. The edge near the bolt hole which doesn't line up is 5.3mm from the side piece compared to 3.6-3.8 of the other corners which aren't as bad but still aren't perfect.
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When I buy the "quality" version of something I expect it to be good and it should at least fit. As well as not fitting it also looks like a blind person painted it, there are runs everywhere and some of the fins came bent.
I will organise returning this one and may end up getting the original fixed which most likely means a recore.