Thank you for your question. Rather than giving you a "cut and paste" answer, I am going to try to answer your question. Keep in mind that there are many manufacturers of implants and even within those, there are many types, so you can likely find what you are looking for. If you currently have Mentor smooth round saline implants, moderate plus, 500cc, then the dimensions of your implant are noted at 13.6 cm diameter and 5.1 cm projection. Let it be noted that if they are overfilled, the implants tend to take more of a circular shape and so they decrease in width and increase in projection. So if you are overfilled to 600cc, then your implant dimensions are actually more like 13.2 cm diameter and 5.9 cm in projection. So, if I understand your question, you are looking for an implant that has more projection but maintains the same width? In the Mentor silicone gel line, the largest smooth round implant with that much projection is the 590 cc Ultra High Profile, which comes in at 12.5 cm width and 6.3 cm projection. So that would give you the projection, but not the volume and the width you are looking for. In the Allergan line, you could choose the Style 45 implant (extra high profile), which at 650 cc would give you a width of 13.2 cm and a projection of 6.2 cm. This would increase both your volume and your projection while keeping the width roughly the same. I hope this helps answer your question. Keep in mind that depending on your exam and your measurements, a qualified plastic surgeon may be able to give you even more options on how to optimize your results and reach your goals so it is always best to get a consultation with a local board certified plastic surgeon. For example, if your chest can support a wider implant, you may have even more options to maximize your projection and volume with a variety of implants. Best of luck!