*** help *** Forgot to remove ROOF RACK inserts *** argh ***

So, I finally got around to installing the Prius Prime Roof Rack (PW301-47005) only to realize I forgot to remove the inserts off my 2017 Prius Prime that was traded in. Toyota Service department suggest looking on Ebay for Roof Rack hardware.

Does anyone have suggestions for replacement part / substitution / etc ??
I've attached PW301-47005 Cross bar installation procedure with parts in green boxes.

 

The inserts came in a package of (4) in first image under box D. It's basically a pin (with if I recall correctly a hollow hole). The purpose was to insulate and cushion the mounting pin and possibly reduce movement and noise.

Argh ... I have the original pins and must've thought those were the inserts!

So, I'm looking for replacements, ideas or possible workaround. I'm done _kicking_ myself.

 

OEM Cross Bars / Roof Rack | PriusChat
Missed this post w/ bigger pictures.

Spoke with another Toyota Parts Department who told me to order latest cross bars. Unfortunately, $ doesn't grow on tree for me. Worst case, I may just wrap mounting pin in electrical tape.