A used set of original Jaguar crown wheel bolts Jaguar part number 6301 as fitted to pretty much all the classic Jaguars.

They come with the original lockstraps 7384 but you may be wise to fit new ones if you can get hold of any.

Aftermarket bolts are available for a about £2.40 each (that's £24.00 for a set) but they are not quite the same as the original ones.