SL3 Throttle lever handle top

[MarineA]

Hi, I’m looking for a replacement plastic top for the top of my SL3 throttle lever - pictures below

if anyone has one for sale or knows where I can get one from that would be great
Thanks

 

[MarineA]

Apparently my pictures were too big, here is a google image - it is the plastic part at the top of the levers I need
Thanks