Just recently purchased a honeycomb style diffuser to replace the ugly piece of plastic on my rear bumper, but now needing the left and right bumper extension trims to complete it.

I cannot believe the price Arnold Clark are looking for these small pieces of plastic, £57 for each side!

Anyone have any ideas on where I could source these at a more reasonable price?

 

Salvage yard or a breaking car on eBay is your only options. They are an expensive piece of trim, I braved the price tag and got them from my local dealer. 

I was thinking of buying the Zetec s diffuse and modifying it (fill in the edges) so I don't need to fit the bumper extension trims, as I feel it would look out of place having them on my car without the side skirts and front splitter, not sure if its possible to fill in or if it would look ok if done that way though.