Sgruver78,
Redline makes a 75w-85 GL-5 gear oil that Redline says meets the 80w GL-5 specification. I haven't found this on the shelf locally, but I was able to have my local Carquest store special order me a bottle. Another option that may be available to you at a Honda dealership is Honda HGO-1 75w-85 GL-5. Hopefully one of these two options meets your needs and is available to you locally.
Belker