It says it fits 2000-2007. You are in 2014-2019, so it doesn't fit here.

 

Interestingly it is the same part number, 51961-30020, as this one from Amazon and many people in the reviews say it fits their Gen 3 Highlanders. Toyota quit including it in the tool kit at some point, so I'm wondering it that was in 2007.

Amazon.com

 

I guess you can get it from AMZ and try it. But they clearly state it doesn't fit.
Ebay also only lists gen 2 for fit.
AMZ says this fits
AliExpress has them for less than 1/2 AMZ

 

Should have the same thread, should fit.

 

Amazon.com: TOYOTA Genuine 51961-30020 Tow Hook, Front : Automotive

Buy TOYOTA Genuine 51961-30020 Tow Hook, Front: Tow Hooks - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

 

Have you used and verified this fits?

 

I have this one and it fits my 2018 Highlander

 

There should be one included with the vehicle.

 

Nope. In the US, RAV4s came with tow hook as standard equipment, Highlanders didn't.