Honestly, I would just take the photo into a Toyota dealer parts department and ask them. If I had to guess, they probably have a giant roll of the stuff and sell it by the foot. They may even just use some generic non-Toyota branded body welting. One time, I didn't want to guess at what size vacuum line I needed for a BMW, so I went into the dealer. Turns out, they just had the same roll of vacuum line that all the chain parts suppliers had and they cut me off a 5 foot section for free (I was buying other parts too).