Has anyone replaced the waterpump on a k12 1.2

Received the pump and now awaiting the coolant to arrive. The replacement pump doesn't have a gasket or o ring but is bonded with sealant, is that right? If that is right what sealant would you use?
 
K12 waterpump.jpg

Does this help? It isn't cheap.....https://www.ebay.co.uk/p/1616358484
 
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