HELP! 4" drop rear leaf springs - which end is which?

[brossow]

Hope someone can answer this ASAP. I'm trying to install a pair of 4" drop leaf springs from ECE on my '72 shortbed. The original springs have the locating pin centered and it didn't really matter which end was which, but on the drop springs it is offset (23.75" from one eye and 27.75" from the other eye). No instructions were included, of course, and their tech support line isn't open until Monday.

Installing them and doing a visual assessment of which looks right isn't possible because all I've got is the rolling chassis. The bed isn't available for figuring out which configuration will center the axle.

Any help is GREATLY appreciated! If I can't get this figured out, my weekend is shot.

Thanks,
Brent