I want lift and implants. What size implants should I get to become a full C?

I would suggest meeting with a plastic surgeon and being measured and examined. Your two breasts are not identical. During the consultation, you can try on a range of sizes to see what size you do like. Please do not chose implants too large or you will sag again.

Cup size seems to be highly subjective and it’s not an accurate way of communicating breast size.
From your pictures, I would not guess you are a bee cup, but would think you would fit more properly into a full C cup.
Each plastic surgeon will have their own way of guiding patients through the implant selection process.
Some plastic surgeons will have patience make the final decision regarding implant size while other plastic surgeons will make the final decision based on input from the patient.
It’s a really important decision That needs to be done as accurately as possible.
Some plastic surgeons do this better than others.
I don’t think it’s appropriate to give you guidance regarding implant size without an in person consultation.
Best,
Mats Hagstrom MD