I got them through eBay, and they still show them available, but shipping was expensive.
I searched for them as part # 65651-60010, which as it turns out is the wheelhouse panel for a 70 series, which is why it was too big. I had searched for the 45 truck, but I didn't notice when I got this part # that it is for the later 70 series.
It was too tall to fit under the curved bend in the sidewall, too long to fit over the subframe, and too deep so it went beyond the main frame.
Short answer is, I see they are still available through eBay, but also available at some Toyota retailers (which escaped me when I ordered these lol).
New and genuine OEM part.
www.ebay.com