The Power Center is a Parallax (or predecessor) unit. Its metal, has a cover than is piano hinged to fold downward, and painted brown.
I'm going to make an expensive suggestion first. You probably have an old single stage power converter. If you buy a Progressive Dynamics 4600 series replacement, you get a new 4 stage converter that is kind to your batteries and comes in a new metal box ready to install in the place of the old one. It also comes kitted with a new fuse panel that will replace your broken one. Buy a converter and get a new fuse panel
Progressive 4600 converter kits
DO NOT GET THE FUSE PANEL YOU LINKED TO, IT IS FOR WFCO PANELS AND DOES NOT HAVE THE PROPER MOUNTING HOLES IN IT.
You can probably buy a replacement fuse panel alone from Parallax, or
Here is one on Ebay for your panel.
I cannot stress how much your batteries will like the Progressive Dynamics converter, 46XX last two numbers is the amperage of your existing converter, 35/45/55 (most likely 45). The new panel provided by Progressive has blow fuse indicators and also has a button that is wired to the converter to change the modes manually (which I have never needed to do).
I have done this conversion twice, once in my Winnebago View MH, and once in my current Bigfoot travel trailer.
Progressive upgrade kits from Best Converter
Last two pics are of the fuse panel I REMOVED from the power center for the conversion, which I have put away somewhere.
Be very careful when tightening any of the screw terminals, to hold the terminal block with a properly fitting open end wrench or pliers, to prevent twisting of the terminal and ripping it out of the printed circuit it is mounted on.
Charles