16's won't fit the 16 1/2 rims. When I looked around a couple of years ago, I found some of the chain tire stores could get the 16.5 tires. They came in what I call the 'old' sizes (32x16 1/2), and I think there is size conversion chart on tirerack.com.
I ended up putting newer model wheels on my '85 van so I could use the 'new' size tires.
yeah 16.5's are getting hard to find. there was one 9.5R16.5 on tirerack for 160 each. tried finding some just by 16.5 rim but it wouldnt let me search that way. I dont remember the size we ran on our 1970 Ford E300 since it had the 16.5"s
I searched around some more, and yea, they're expensive. A couple of Craigslistings came up for humvee tires, but those are like 35's, and I don't know how much wheel well you have to work with.
Are your wheels 8 bolt? I think you're going to be better off converting over to a 16" rim and allow for more common tires. Like I said before, I did this to my van - and I get nice used tires from an EV service shop for free.
Good luck, I'll keep looking...
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