Replacing 100A and 140A Fuses

As you can see, the 100 and 140A fuses are not blown, but broken off from the previous owner trying to replace them. Although they're not blown, I'm still replacing them, but I can't get the fuses out because of the bolts blocking them:

I can't get a socket wrench in there because of the fuse block in the way pictured below. There's four tabs on it, but I can't get it off no matter what I do. Any ideas?

 

Thanks for the help. Should be fun

 

Were you able to fix it. I'm on the same boat.

 

Yeah, I cut the small piece of plastic in front of the bolts and used a small crescent wrench to get them undone.