Sturney/Archer Oil Caps?

[Gold Street Customs]

Very rarely do I come across these with the oil cap intact, is there a source or a cheap substitute to cover the hole after you oil it ? Let me know,thanks

 

[scrumblero]

number 3 on the list..

http://sheldonbrown.com/harris/sturmey-archer-parts.html#3

 

[Gold Street Customs]

Cool!!

 

[streetpirate]

I stuck a zerk fitting in one, threaded right in!