This might help
Corvette Action Center Knowledgebase :: 1997 - 2004: Service Bulletin: Fluid Leak at Rear Axle (Replace Left Differential Side Cover 0-Ring and Left Axle Shaft Seal, Add Sealant to Side Cover Flange))
I have a Z06 lid on my 04,fits with no problem. I don't run a K&N fillter just a standard paper filter. I am not sure but I think any C5 Z06 filter lid will fit.
Chuck
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