chrome mirror inserts

[hiii98]

i just bought this used chrome driver and passenger side mirror covers off of ebay. I then went to "pop" them into place . After trying to do so i found they would not as the clips or somthing prevented the cap from making a complete fit. It would only go on about half way then appear stuck. I was wondering if anyone with around a 2004 h2 or whatever had similar problems when trying to add this custom chrome cap to the mirrors. I dont know if i'm supposed to break off the metal prongs (as shown in the pic) to make it fit or if more likely i'm just not doing something correctly while trying to install.

pictures below