A genuine used Jaguar part stripped from an S Type rear suspension unit, inner fulcrum shaft thrust washer part number C17166 item 11 in the illustration.
Fits pretty much all the classic Jaguars with an IRS but obviously check compatibility before committing to purchase.
At the time of listing aftermarket reproduction items are available from £6.28 each but they're just not the same as an original Jaguar specification item.

This item is used but in good condition so if you want a good original Jaguar part this might be for you.