Up for Buy-It-Now is a new old stock carburetor power valve piston assembly, Rochester part number 7004302.  According to my GM Manual, this is used on the following models and years:

1952-1953 Cadillac & Oldsmobile

   I opened up the package for the first time to inspect and take pictures. The power piston is in brand new, never used condition and is free of any damage.   The original Rochester package is in good condition. Please feel free to E-mail me questions.  International bidders are always welcome.  Thanks for looking!!