I believe there's a sticker with the part number on the top section. You can use an inspection mirror or your smartphone to take a picture. If the sticker has been there a good amount of time, it will probably not be readable anymore because it's not waterproof. I don't remember the exact location of the sticker, but it might also be readable from the top of the strut tower mounts where there is a removable plastic cover.
Honestly I wouldn't worry about it, just plan on replacing them in the future if they fail and budget for it.