Thanks for the replies. And I stand corrected; the wheels are indeed 5.25 with 7.25 bolt circle. Availability of older vehicles in this area is, at best, sparse, as is the interest in a truck of 'that age'. (If'n it don't carry 40+ tons of logs or better it ain't a truck.) Nonetheless, I shall advertise for suitable wheels. The Tech Tip is a great read and certainly clarifies many of my concerns.
As for a photo, well, I have one and will attempt to post it but the dial-up in this region is akin to a native runner carrying a forked stick thus success is by no means guaranteed. I appreciate the help, fellows.