Like all aftermarket parts, they do need some fettling to get a great fit, the wings for example have needed some modification to the mounting points to fit correctly but being non-OEM parts, that is to be expected. On the plus side, the metal thickness is far better to some I have seen repairing crash damaged cars and a good few parts are galvanised as well to help keep the dreaded tinworm at bay.

All in all, decent panels at a decent price if you are looking to resort the various rust problems the T4 seems to suffer from

https://carvanbits.co.uk/product-category/uncategorised/auto-body-repair-panels/volkswagen/vw-transporter-4/