Check your part number in Jag Parts Catalouge as on my 1987 Cab it is different to std coupe. I bought a replacement last year direct from Jag Main Dealer £52 from memory. Have a look on Jag Heritage Parts.
Mine was really gummed up with ‘varnish’ and showed full, tried to repair but couldn’t so replaced with genuine Jag part, reasonable price – some things are!