I want to bypass the seized a/c unit on my 89 coupe deville (4.5L motor), but don't know which serpentine belt to buy, Can anyone help?

 

Thanks to the folks at NAPA in Dartmouth Nova Scotia, I was able to find the right belt by trial and error. The proper belt seems to be 77-3/8". It's been on the car for 5-6 days and works great. In the spring, I'll have the a/c flushed and a new compressor (which I have) installed.