Here's my 2 cents....
If you're modeling the gasket at different lengths, you have a family
table for all of these gaskets?
Use or create a parameter for the part number of this gasket to be used
in the BOM and add to the family table.
I have had this type of parameter update automatically by parsing the
length of the gasket value onto a parameter that includes the generic
part number as well.
The length of the gasket can be found by creating a saved measurement of
the curve length for the 'spine' that the gasket is swept along.
It may report the length in inches, so you have to do more programming
kung-fu to get the value in decimal feet and then convert this to a text
string that can be appended to text string that includes the generic
part number.
Christopher F. Gosnell
FPD Company
124 Hidden Valley Road
McMurray, PA 15317