Yes come in 5x100. But, in anything bigger than 8.5" pretty sure you need to pay custom PCD fee, as the 5x100 range is limited.

18x9.5 + 38 shouldn't require to much work, will have the same size Rota Grids coming next week for my bugeye, hoping I can get away with coilies, bit of camber and a slight roll.

Will post pics if your interested.