I've noticed a fair share of folks looking for fork boots so here's an idea. I've seen these boots on the rear axle of riding mowers that look like they'd work but I haven't tried. If I remember right, they're about 1" to 1 1/4" diameter where they clamp on. Here are some links if somebody wants to take a little gamble.
Snapper Boots - Replacement Axle Boot
Snapper Seal Boot - Stens 240648
Snapper 7075115 BOOT AXLE
Snapper Boots - Replacement Axle Boot
Snapper Seal Boot - Stens 240648
Snapper 7075115 BOOT AXLE