Bonsour silverstriker,
You can use the newer type racks, that is for the larger present type strikes. To hold the older type strikes. I have found the newer racks works great with the older type strikes. And as a BONUS you can get 5 more of the older strikes in the newer racks, than you can get in the older racks.

Also, it probally will be easier to get the newer type racks.(as I understand IGT does not want them back) Than to get the older type. Some of the casino's just throw the newer racks away. And will give you 1 or 2 or so, if you ask them for some.
Dan