The KK-5040 Upgrade Head Kit has been discontinued as a replacement part.
This KK-5040 Kit consisted of the AC-0038 head and the AC-0032 Valve Plate with O-rings.
If just the reeds are broken on the old valve plate then you can order the AC-0032 Valve Plate and install the reeds from the AC-0032 valve plate onto your old valve plate.
The KK-5040 Head and Valve Plate Upgrade kit is used and many of the older oil free air compressors made by DeVilbiss and Sears Craftsman.
This kit will need to be used when upgrading from the CAC-4281 Valve Plate and the CAC-4281-1 Valve Plate.