Tire help?

[Iz-T]

I know you guys have probably been asked this a million times and I hate to be that guy but I'm new to all this. And I figured there's no better crew to ask than you all.

So I just got a new (to me) 72, which I'm in love with.DSCN4329 by Turley Knives, on Flickr

But I'm not in love with the wheels and tires.
My plan is to go with stock steel 15" x 8" wheels.

Here's my problem. The truck has a 4" lift in it that I don't want to take out. The tires on it now are 33x12.50.
I'd like to stay with that same height tire but go with a much skinnier size.

My question is, do any of you know where I can get 33" tires for 15" rims but no wider than 9.50?

I can't seem to find any new tires in that size or narrower.
Any help you could give would be much appreciated.
Thank you!

*Edited* to add: I'd like snow and mud tread for sure. But nothing with real deep tread. Something around a 19/ is what I'm thinking. Nothing so deep that it won't balance well and ride like crap.