P/S valvecover grommet??

[Roc87]

Installed my new Buick Motorsports valvecovers (Thanks 1QuickV6) and I tried removing the grommet from the passenger side breather but it was too dried up to come out in less than 10 pieces . Where can I find a new grommet? TIA

 

[Nick Micale]

The GM number for the grommet that fits the stock cover is: 1264486.