The GREEN BIBLE on page 174 shows that the 1940 Ford sedan delivery station wagon and commercial (90 and 100 HP) used front spring # 01A-5310-C with 11 leafs.
On page 190 the GREEN BIBLE shows that front spring # 01T-5310, 11 leaf front spring was used on trucks, except 122 in. and COE in 1940 and 41.
Same book shows that rear spring assembly # 78 5560-C, 12 leaf spring without cover was used on 1937-41 Ford sedan dellivery.
Dimensions you desire are not listed. Perhaps others will chime in.