I would look for a 15x12 aluminum slot. They aren't cheap, but they do show up occasionally. Start with the wheels you want and work backwards. Sell the wheels and tires you have as a set.
With just 15 whole posts in nearly 3-years, we will give you the benefit-of-the-doubt that you are unaware that tangling with a moderator is not a good idea. Being here for 13-years, having over 21,000-posts, and actually voluntarily paying to be here does not even prevent you from having posts deleted, threads deleted, or getting a good talking to, should you go over the line. Nor should it. This site has very specific rules, and nobody gets a free pass. If you want to see one of my builds, you have to look elsewhere, and that is how it should be! You will periodically see profiles with the word BANNED where you would see Member or ALLIANCE MEMBER. Those are either people that continually refused to follow the rules, tangled with a moderator, or both. Respect the rules, and more importantly, respect the moderators and board owner, doubly so when they call you out. We won't judge you here for making a mistake, but we sure will if you recover poorly from doing so.
I see slots at the swap meet all of the time, in up to absurd widths. I am pretty sure I have seen 15 x 14's. They don't sell well, because few can run a tire that wide to fit them.