If you lost your standalone FAA Pilot Certificate (or if you have a new address), you will easily get a new one : the process can be done entirely
on the internet and this
will cost you $2 per certificate reissued.
This simplified process is not available for the reissuance of foreign-based Pilot Certificates.
You will need to know you height in inches and your weight in pounds.
If you are not familiar with these units, this converter from cm/kg will help you: