Thanks rifraf. The tires on my bike are 35mm, so it's good to know tire fit won't be a problem. I ordered the Cosmo rack and it's been shipped.
The Tubus Tara front rack is offered in stainless steel which should/might match the finish of the Cosmo rack, but it's also $50 more expensive than the standard Tara rack. I will wait until I get the Cosmo rack before spending more money!