I have a thread running in the Valuable Info forum showing photos of various Glocks, including a Gen1 factory-ported 17L. Click the link below to visit it:
Go to post number 7 to see the Gen1 factory-ported 17L, and check post numbers 30 through 32 to see the 24C, 17C, and 19C factory-ported Glocks.
If you really wanted a ported 17L, you could buy any generation 17L you'd like, and install an aftermarket ported barrel made by a company other than Glock. Or, as said above, buy a 17L and have the stock barrel ported by a company like Mag-na-port International: