Penile prosthesis : do you know if there is "oversize length" for afro-american race?

Onesize does not fit. Selection of prosthesis depends on the length of penis, one size does not fit all, not selected on racial basis.
Yes, but... The length of penile prosthesis is decided by real measurement during implanting surgery. But remember the girth and length of post-implant penis will be not as long or big as the original coming with life.