I probably would have purchased oem if I knew they were available. Whatever site I was on seemed to only sell the entire hard lines for hundreds of dollars. Got a link?

 

I usually get parts from my local dealer because I get 15% discount unless I find a better deal. I found the part number in the Lexus catalog and it seems to available. Let me know if it is the correct one.

https://parts.lexus.com/p/Lexus_2010...837430010.html

 

Looks to be the correct one. At first glance I thought it was the cap. The stock pictures don't help much. Sometimes for these small parts I forget about taking a trip to the dealer to purchase them. Thank you.

 

Good point about Lexus and Toyota dealer parts dept. It's easy to overlook the obvious sometimes.