Implants come in many shapes and sizes
Breast implants come in many shapes and sizes. For a given implant volume, the projection can be normal, moderate or high. It all depends on the shape of the shell and design of the implant. So, you need to look at more than just cc when deciding on an implant.
The considerations you need to include are your breast base diameter, remaining tissue & desired final size. If you have already had the mastectomy, then you may also need an breast expander placed first to help...