Missed this one on the multi quote... LOL The U-bolts don't have to be longer, but I always replace the U-bolts anyway. Lot's of guys don't, but they are cheap enough to replace and the old ones have been stretched for 50 years. The shackles are easy to break when removing. Your car looks pretty clean, so they might not... but again, they are cheap to buy and expensive for you to ship. I'd buy new ones.