Aeromotive Fuel Pressure Regulator

A friend of mine gave me an aeromotive fuel pressure regulator. I'm not sure on the part number, so I'm not positive on the application that this works on. The on I have is on the right.

<img src="http://static.summitracing.com/global/images/prod/large/aei-131-02-b.jpg">

Does anyone know which is which? One of them is 13102, which works with the 4.6, and the other is the 13103 for the 5.0.

Thanks

Cool. I have a set of the aeromotive rails that are going on the 98 this weekend too. I checked the Steeda ones that were cheaper, but they require mods to install.

How well did the regulator work for you? Is it easy to tweak?