The metal 't-bar' part; it rotted in wet weather.

Click on; Southern Freedom offset umbrella - Google Search (http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLM,GGLM:2009-22,GGLM:en&q=Southern+Freedom+offset+umbrella)
And contact the manufacture.
Good luck, Tom

Go to this patio umbrellas (http://www.epatioumbrellas.com/umbrella_stands_bases.html) website store, they are selling bases for all types of outdoors umbrellas. But you can also search on Google. I hope this helps.