I have fender tag info for 76 St. Louis assembled '69 Super Bees:
I understand this is a small sample 40+ years later, but W1 is 3rd (7 examples) with F5, R6, & Y2 close on it's heels.

3 - A4
1 - B3
10 - B5
0 - B7
0 - F3
6 - F5
1 - F6
9 - F8
0 - L1
4 - Q5
4 - R4
6 - R6
2 - T3
4 - T5
5 - T7
2 - V2
7 - W1
2 - X9
6 - Y2
1 - Y3
3 - Y4

7 of them are "SPRING SPECIAL" A39/A40