Rear wings fenders

Anybody has a good link where i can find the differences between the rear wings on a bug ?
I am going to a friend tomorrow who has a lot of pieces collected over the years , i wanna find to rear wings for my callook split project.
So i am specially interested in the pre 67 rear wings .
What changed from split to oval , from oval to 63 and 63 to 67 .
As the car will be cal look without matching numbers etc i am not necessarily forced to go with og spilt fenders but i don t wanna run some obvious wrong ones either .
Thanks in advance
Sam