Thanks Larry. It's 18" front pivot to center of the rear axle, and about 8.50" wide at the front pivot (where it fits in the frame). So if I could find one that is about 19" to 20" long, and has the right width at the front I'd be interested in trying it.
I have a welder so if I need to change the shock mounts that is no big deal.
I'd really like to put an aluminum swingarm in the back. I did that years ago on my 78 Suzuki GS1000, the swingarm from a GS750 fit right in.
I'd even like to put an aluminum twin shocks swingarm on my GN400 ice bike just to remove some weight from the bike.
Let me know what you have, thanks.
Andy