US Mag Indy wheel question

If I ran the Slot mag, I was gonna run a 225 width on the rear.. US Mag lists the backspace as 3.80 and Summit shows 3.75 but 4.0 or more would have been better. I’m sure they’ll fit but it’ll limit my tire choices

Looks like the back order is to July on the Boyds. That would be a sweet wheel with the gray centers.. chrome looks good but on a wheel that size.. it’s almost a little gaudy