[ERA Chas]

Yes the footbox has that general shape. The early cars (which is what I have) do not have the extended boxes which came later but I do not know at what chassis number.
The difference with my car is the reservoir which is mounted on top and the clutch line which crosses the footbox and goes down the side to the clutch master right at the last exhaust port. My clutch hard line is covered in Firesleeve for that reason.
You later number guys have the 3 cans on the fender well. Don't know if 392 which Argess has came with the cans or my set up. I made that access hole 21 years ago.