The early 221/260/298 covers have been reproduced. The style shown here have the raised area at the rear of the cover. These were used up to 63 IIRC. After late 64 they gained a hole for the
oil filler cap as the
oil filler tube was removed from the front cover to allow the larger diameter alternator and well as other items.
The Shelby team cars ran these with extended tubes welded on to raise the breathers to prevent
oil being pushed out of them. They were often painted with Ford "Argent Silver" paint which is still avilable as well as other dull silver colors
Fran has them as well as the "Shelby" decals and the repro oil caps.