I never thought of looking at the Moss catalog. The show the top frame for the MKII Sprite as part number 400-648 for $356.95 Not cheap, but if you need one and can't find one anywhere else it's an option. You might also check with Tony Barnhill "The Autoist" as he might have what you need. http://www.theautoist.com/
'73 Midget (V6)
'59 MGA (I6) under construction
"There is a fine line between a hobby and mental illness"