Hi all,

I’ve been easing myself into the triathlon world with a couple of sprint distances on a road bike while in school. Decided to take the plunge and build myself a bike as I aim to start ramping up my distances.

Picked up a used frame (Prologue Aviation 2.5) and nearly have it completed. Went to mount the rear wheel and realized that I am missing an insert from the rear dropout on the non-drive side. I’ve attached an image of both sides; does anyone know what this piece would be called or where I might get this piece?

Thanks!