Mopar rear end question

I have '54 Dodge Royal with a '61 Chrysler 300 rear end. It works fine but it's too wide. Tires rub at times, but not bad. The problem is when I have to remove the back wheels, I have to remove one end of the leaf spring to take the wheel off. If I get a flat on the road, Im in deep s**t. The one I have now measures 54 inches pack plate to back plate. Is there a mopar rear end that anyone recomends to replace the current one that isnt as wide?
I would also like to keep the same bolt pattern.

Thanks for your help.

 

Here you go brother,
http://www.440magnum-network.com/info/tech/rearaxle/moparrearaxle.shtml

 

I have that problem too with my stock rear end, lowering blocks to big. pain in the *** taking off my back tires.

 

Thanks Bro, that was fast.