I bought a salvaged complete driver side (left) mirror for our 2015 Honda CRV on eBay.  I replaced our broken mirror and used our current matching white cap.  I have no need for this one.  You can reference the auction for additional information... https://www.ebay.com/itm/156051669683

This was verified using the VIN # 2HKRM4H53FH696724

You can find instructions for replacing the cap on Youtube. 

The cap is in good used condition.  No major deep scratches.  It does show normal 8+ year wear in sunlight (tiny pitting/scratches).  All 5 tabs/clips are perfectly intact (see photos).