8 3/4 leaf spring u bolt size ?

jazak5 said
what is the tube diameter //reading that I should not reuse them? broke a nut off anyway

Three inch. I like these:

NOS Mopar A, B, E-Body Rear Axle Spring U-BOLT Set 8¾ & DANA 60 Plymouth Dodge | eBay

The price is for all four bolts and the correct nuts.