I need a transformer like 595-1044-ND 100va that has an output of 200-250va.

Welcome to the Forum Gary. I could not find anything in that series do go to the power you have listed. Though I did come up with more chassis mount options in that range on this link:

I could not get the same secondary voltage. You can review these options and see if you can make one of them work for you.

165V12 or 167V12 might be worth a look.