Spacer thickness for Tire Upgrade 380*15*5 ?

I'm getting my order in for doing the Tire Upgrade 380*15*5 for my RV4. I'm looking for a part number to order this spacer to move the brake caliper out from the wheel. I'm not even sure of the thickness required. I could use thin washers but the spacer would probably be structurally stronger. Would anyone know the part number and thickness required? I've looked on AC Spruce and haven't anything there at least broke out separately. But then again I could have missed it. This is on a 98 RV4 with the stock wheel pants that I'm doing this conversion on.

Thanks

Tim

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I made the switch on my RV-8 this past winter. I didn't need to add any spacers. I did need to open up the bottom of my wheel pants quite a bit. Fortunately for me, I had the critical clearance to the top of the wheel pant. If you don't have that, then there is a lot more work to making the switch.

Hello Glen

Did you have the old style pants or the new style pressure recovery?

Thanks

Tim