A used Jaguar MKIX front brake caliper body 7780 these larger bodies were only fitted to the MKIX in the Jaguar stable and can take the larger 2 1/2 inch pistons.

I'm not an expert of the light weight E Type but there are listings on e bay which offer these to fit the E Type (light weight or racing)

In as found condition and will need a good old clean and a fresh coat of paint.

Believed to also fit certain Jensen, Aston Martin & Lancia models.