It's also identified as 36 SC. And while it's an older tire size it's still a pretty common item for the Invader operators. Same NW tire as used on our PB4Y-2 Privateer and the remaining flying B-24 as well as NW tires as used on the flying B-29s. It's also a P-38 MLG tire. I don't recall the aero tire retailers as having any in stock, but as recently as 3-4 years ago we bought a brand new one from a vendor in the pacific northwest (either Washington or Oregon) who reportedly had a mould made and was offering the limited production run of diamond tread rubber (not smooth contour). He was posting on one of the aircraft parts exchange sites. The inner tube was far more difficult to locate than the tire casing, but that's another story. Hope this helps.