Does anyone have an idea of where I can buy new boot registers for an old octopus furnace? I need a total of four: one is 8x10 with an 8 inch diameter and the other three are 9x12 with 9 inch diameters. I found the 8x10 but have been unable to locate the 9x12's. The ones I had were rusty and covered with a good amount of asbestos residue that proved to be too hard to remove even when wet.

The mistake I made was assuming these boot registers were standard size and that any plumbing supply store would carry them. It wasn't until after I threw them out and began shopping for new ones that I realized nobody - around Syracuse, NY, anyway - carries them.

Thanks very much for taking a minute of your time.

Very grateful,