Battery hold down question

I bought a battery hold down kit from Mancini, the description says..

'Battery Hold Down Kit
1970-1971 B- & E-Body and 1970-1972 A-Body

Battery hold down kit includes the correct black phosphate J-bolts with SEMS nuts and a thermo-plastic coated cross bracket.'

And this is what it looks like..



Here is the web page, the one I bought is the 5th item down on the right..

http://chucker54.stores.yahoo.net/bareit.html


The car is a 70 Dart. My question is, is my battery too tall? Or is there a trick to this? What seems to be happening is I don't have holes in the correct places in my battery tray to make this bracket work, and even if I did, one of the hooks with threads is too short to even reach the top of the battery, as one is shorter than the other. Am I missing something?