I have a 77 280 that came with the collapsible inflatable accordion spare and I recently completed a project to replace that collapsible spare with an always inflated newer "donut" mini spare. I bought a T115/70/14 donut spare tire and wheel from a junkyard. It had the correct lug pattern, but the inside diameter was too small to fit over the front brake calipers. It fit OK on the rear over the drums, but wouldn't work in the fronts. I came up with two options. 1) use that donut spare as is