Rebuilding is an option https://www.damperdoctor.com/

HOWEVER, I just had my '69 340 balancer restored by them and when I got it back I found they had not indexed it correctly. They apologized and will pay for shipping both ways. Looks like they do many many dampers, but was not impressed with their quality control processes.
Jim


1970 Superbird 440-6bbl, auto
1969 Barracuda 340-4bbl, FB Formula S auto
1969 Barracuda 6.1 L Hemi, 5 speed, Convertible
2022 Can Am Spyder RTL