Thru Axle Scalloped Bush

[MudLark]

Hi guys, on my older Trek (Superfly 8), the rear thru axle is of the type where you force the lever down to lock the axle. Under the lever is a scalloped nylon or plastic bush. This bush has broken in half and fallen out. I don't particularly want to replace the entire axle if I don't have to. Any idea where one could obtain the bush from? I can't find it sold anywhere online.