Hey, mdobob, I have the same G-3 as you. When the cover that came with the boat rotted out, I bought one from Bass Pro Shops for a little over a hundred dollars. I bought some PVC pipes from Lowe's and made a tent like frame for the middle of the boat and it works great. Do a product search for "Boat Cover" on BPS site and there are a bunch to choose from.

If you find something better let me know,

Grumpy