Authentic Candy shirts can get, just be sure you are aware if you are getting the original release (ie from 1989) or the official repro by Adidas (the Originals series where the "Liverpool Originals" tag will be on the nexk label).

Thos on Mudah that Ive seen are a mixture of both. The grey kit is either ori release or fake. Ori normally veryvery small sizes. youth or s.

Red ones are likely to be from the Originals line. 

And the blue one you see on some mudah site, thats plain fake