Mine were looking manky & I came across these on ebay..........listed for a3 8l/a4 B5 etc replacement & being led I thought it'd be a nice lil upgrade. Load of sh#te!, once I'd gotten the originals out I soon realised these come with a 2 pin plug where as ours or at least mine were the type (from memory) where the bulb is held by the two contacts and that then pushes in making the connection, not sure what the correct term for those is but it was definitely a no go.
I might just give the originals a good clean out & get some led's to replace the original bulbs