I'm not sure you need to worry about the drivers. The print job should get redirected - as the name of the printer on the client will say (redirected) - to computer being accessed and rendered there.
Spike99
You do need to worry about the drivers unless you're using either the Citrix universal driver or the TS Easy Print driver from MS. It won't print to the client's local printer unless the driver is on the server. But, since this is a Windows 7 system, I'm pretty sure that Easy Print driver wouldn't apply: the driver for the printer needs to be installed on the remote desktop for printer redirection to work.