DD and Albie have the right idea. If you look on any of the current spare parts sites you'll find that the part no. for the gasket has been updated and the new part no. actually refers to Threebond.
However if you feel you absolutely, positively have to have an actual gasket, there are some NOS Cagiva ones available from Italy for £25.
https://www.ebay.co.uk/itm/Guarnizio.../254203569543?
As far as torque settings are concerned, if your screws are M6x1, then they'll probably be the same as my Evo at 13.5Nm.