I have a 8-3005 and an 8-3001 and several stock style coils so I took a measurement for you..
First off, the 8-3005 is the same in all spec's as the 8-3001,, 3 Ohm Single-Fire.. The only diff is the Outer dimensions..
The Outer dimensions of the stock style (vintage.???) coil that you may think will fit-up with this fancy Vintage cover is almost Identical to the 8-3005 coil and is shaped roughly the same,,, quite diff than the the 8-3001 coil..
Soo, since you are running the 3 Ohm Single-Fire 8-3001 you are obviously running a Single-Fire Ign, doesn't matter which kind or brand since the Ign and coil are evidently matched up,, so in that case, the 8-3005 will simply replace the 8-3001 if you choose to try it..
Fill your hands you son of a bitch