| Fan-bloody-tastic an 888 as your first bike !!! Woohoooo, great taste.
As Monty says, the zorsts seem to be ones that should fit your Strada. The only size it mentions is 42mm so they look like they should fit over the 40mm Strada 'manifold'. If they were high level pipes from a 888 SP they would be bigger diameter.
As Monty says, they will bolt on to the existing pillion footrest mounting points, so you'll lose the ability to take a passenger....but you probably won't want one of those anyway.
Nice find....I'd have 'em for my Strada...if I had the spare cash | 
Jools
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