The key identifiers can be found on the K2 website, at this link: www.k2conservatories.co.uk/buying-k2-genuine-k2-product

The easiest part to look for is the End Cap, situated at the end of the ridge bars, over the gutter, to see if the screw cover has a K2 logo embossed there.

Gutter clips/brackets (Part No. C8043) are also easily seen.