engine valve cover gasket

[tonci26]

I own a 2003 z1.8xe Vectra and i have a leak of oil on the engine valve cover gasket how difficult is to replace it does anyone have how thighten the bolts should be?
And does any one have the part no of the gasket?

thanks

[Critch]

Really easy an rocker bolts are around 10nm don't know exactly of top of my head

[tonci26]

thanks