Thanks Doc, and all. I found a hubcap / wheel cover in the end. My wheels are Prime wheels. Couldn't ever find the model but after a lot of online searching and the comments on this thread, I finally spotted what looked like a PRIME marked on the inside of a wheel (its small and in deep, easy to miss). I went to ebay as suggested and found one with the measurement I need 7.25" diameter. what a pain it is to loose a hubcap! Mine are plastic and the single bolt hole was slightly broken on this one when I got the truck, so it was no surprise it broke entirely and fell off. I'll be checking and ensuring I don't loose anymore as I suspect they'll get harder to find and more expensive. I got mine for $20, but see others (same) for as much as $75 each!
Thanks again all.
