The below image's link points to this site, but just reads vacuumland.org with no specific URL. I enlarged the image for clarity.

There was a site called theelectroluxman.com whose business was reconditioning and reselling vintage Elux vacs. As I recall he actually had one or more adapters for sale. The site appears to be no more, as I got a 404 error just now.

As an aside, I once had a model L that someone had installed an XXX or similar (thick fans) motor in. It was fine with genuine paper bags, but strained with third-party bags, even multi-layer ones. I wonder how many people used this adapter with bojack bags and were disappointed with their vac's performance. I would think that the Elux salesmen would have strongly stressed that genuine bags were a must.

Joel