PC T6 Steel Knuckles mods?

[DonDregon]

I've decided to build with knuckles this time and to my surprise, I cannot use 4 mods on them which is hilarious.

1. Ergonomic Grip Mod or Fortifying Grip Mod or Structural Brace Mod
   
2. Rad Remover Mod or The Hunter Mod (exclusive, cannot use both at the same time for any reason)
   
3. Weighted Head Mod or Serrated Blade Mod (exclusive, cannot use both at the same time for any reason)
   
4. ?
   

What else can I use? 

 

[theFlu]

Any of the tool mods will fit, flaming shaft might.. and the structural brace isn't a Grip, right, should fit right along with Ergo?

 

[Roland]

I wanted flaming fists but alas the shaft doesn’t fit….er….yeah. 

 

[pApA^LeGBa]

Wood splitter maybe?

 

[Old Crow]

I've decided to build with knuckles this time and to my surprise, I cannot use 4 mods on them which is hilarious.

1. Ergonomic Grip Mod or Fortifying Grip Mod or Structural Brace Mod
   
2. Rad Remover Mod or The Hunter Mod (exclusive, cannot use both at the same time for any reason)
   
3. Weighted Head Mod or Serrated Blade Mod (exclusive, cannot use both at the same time for any reason)
   
4. ?
   

What else can I use? 

1. Fortifying Grip

2. Rad Remover

3. Weighted Head if you want stun, Serrated Blade if you want bleed

4. Structural Brace (it's not a grip)