Replacement fill cap

Where can I find a replacement fill cap for the power stearing pump?  Any GM dealer?  I'm sure it was missing from the oil change place but I can't prove it.  I't's being covered by heavy duty aluminium foil and small hose clamp just to keep the dirt out.

Thanks

Any gm dealer should have the part.

GM Parts House, part #8, is that it?

And that guy is a member on the forums, he'll give you a good price.

Thanks Guys.  That's just what I need.

Probably to late now but have you tried calling where you had your oil changed, They may have found it later and not know where it goes, you might want to give em a try before shelling out the cash for a new one