Island Packet Yachts sells a mast gasket on their website. Might call or email to see if this is good for the 37. For the record, you have an Isomat Mast NG-60 which is no longer made and all parts are with Rig Rite in the US. I checked the Rig Rite site and the original mast gasket was a special number finished in white for IP - part # NG60-15BIP which shows not in stock. Many other parts associated with this mast are in stock.
