Correct for a B8.5 - I'm respraying the diffuser so bought a duplicate to save the original parts, had quotes from Audi (and this is using my friends discount) the diffuser was around £115 but the insert blade that goes across cost almost £200
Ended up sourcing one off eBay used for £120 both parts and delivered from Germany
Be careful as buying used off eBay the seller may only have the diffuser and not the blade. The blades seem to be hard to source