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Fuse Box
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Try Lectric Limited.
I have compared the 82 fusebox (I once had an 82) with the 81 fusebox (my current project) and I believe the housings are the same. I have the service manuals and a lot of electrical tech data for each model. I attached a photo of my 81 fusebox and wiring harness when I had all of it stripped out of the body for a total rebuild and compared to the 82 it looks the same. With the entire harness removed and out on the bench where you can work on it, the fusebox can be separated from the bulkhead connector where C100 and C115 harnesses plug in under the brake booster. Once you have access to the back side of the fusebox you will see the power busses that have the fuse terminals made onto them. The fuse terminals are actually Packard Series III connectors. A couple of years ago I found a source for the connector busses that would allow you to replace or change the configuration of your fuse box. I do not know if the source still exists, I can try to run it down if you are interested. It is also possible to hand build a connector buss using the Series III connectors. Yet another avenue I have gone down is to do a junkyard crawl through other GM vehicles from that era and get the fusebox out of them. I never needed the entire harness so they could just be whacked out for less cost. I could usually find a power buss to transplant into a different fuse box. But these days older cars like that are getting hard to find and the junkyards often don't want to cut up a harness.
Here is the 81 fusebox I was working on.
The 82 moved the 81 Elec Fan fuse up to the unused cavity under the Theft cavity. The 82 then used the Elec Fan cavity for Injector 1 and the unused cavity in the 81 just below the Elec Fan for Injector 2. The power buses on the back side of the box were re-arranged accordingly.
You have several choices for a solution depending on what your ultimate goal is. For a correct stock rebuild you will most likely have to rebuild the box and harness you have or adapt another box to your existing harness, assuming the harness is ok. It's a pretty involved process but can definitely be done.
If an aftermarket fusebox/harness fits into your plan, then that is obviously another option. But be prepared for some modification/fabrication. I'd be surprised if an aftermarket solution is 100% plug and play.
Either way, replacement of your fusebox and harness requires major surgery and is not cheap. In my experience, removing the dashboard assembly is necessary to remove the entire harness. The dashboards on these old cars is somewhat fragile due to age so that can open another can of worms if you aren't careful.
So that brings me back to a question, are you certain the fusebox you have can't be repaired in place? If it's damaged due to an overheated fuse terminal there are several options available. Almost anything is preferable to removing the entire fusebox unless there is just no other choice.
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