bienvenido!
as mentioned above you can do a search here or ask morristown BMW in the vendor section. you'll have to ask about shipping to
PR though.
you can also go to your dealer and order them...it's not a cheap mod, especially if you go OEM. also, you may be able to do it yourself depending on how handy you are.
many folks here have done the OEM RB mod--it's a great look for the X!