front spring

[eec2]

hi all bought a 12 leaf spring for 31 ccp. put on with spreader, spring is hitting balls for shock mounts on perches. took off ,measurement, center of eyes 30- inches , specs say 30 5/8 to 30 13/16 center to center .am I correct the spring is not long enough. called supplier **** new supply they got all measure this . am I missing something. don't ask a lot because I get answers from posts . thanks