That might be the only one! There were some built by customizers from Fairmonts, called the Durango… https://blog.consumerguide.com/ranchero-sequel-remembering-the-short-lived-ford-durango/ Patrick
Since we're taking 'utes' here's another obscure one. https://silodrome.com/south-african-chevrolet-el-camino/
No Opel, but plenty of Holden. The six was the Chevrolet 250 ( which we never saw in Australia) while the V8 was Holden's 308. I first heard of them when I bought a book of El Camino road tests in pre internet days and there they were. Some more Sth African El Caminos here: https://www.curbsideclassic.com/blog/cc-outtake/cc-outtake-the-bakkie-is-back/
This is the one I wanted. Thanks to our politicians ‘helping’, Pontiac got axed right before we got it.. https://www.caranddriver.com/news/a15150440/2010-pontiac-g8-st-pickup-killed-car-news/ Patrick