What cars bolt pattern is 5 x 121?

none. That would be 121 inches between each lug nut,and you would have that times 5,that is a huge rim with no support what so ever.

I think they mean 121mm not inches. That would mean 5 bolts in a 121mm circle or in inches it would be 5 bolts in a 4.76 inch circle.

yeah i figured.