http://www.thercshack.com/rearalumin...xxandxxxt.aspx
but out of stock and since these aren't made anymore I guess Ebay would be the best option.
Oops just found another one but looks like bizarre webshop if you ask me.
http://www.shopkyosho.com/search/158.0?q=tk5016
Guess somewhere on this planet there's got to be a store with lots of oldskool Trinity parts