From left to right (early>late):
fuel tanks with different fuel neck diameter. Note that on the 1950
model (far left), the tank's rearward mounting bracket is to the left
of centre. On later models, the tank's rearward mounting bracket occupies
a central position
1. From ch.number 20-00001
until 20-05001 fuel neck diameter 100mm.
2. From ch.number 20-05002 until 20-030867 fuel neck diameter 100mm.
3. From ch.number 20-030868 until 20-047001 fuel neck diameter 60mm.
4. From ch.number 20-047002 until 20-117901 fuel neck diameter 80mm.
2. From ch.number 20-05002 until 20-030867 fuel neck diameter 100mm.
3. From ch.number 20-030868 until 20-047001 fuel neck diameter 60mm.
4. From ch.number 20-047002 until 20-117901 fuel neck diameter 80mm.
