Project16 Picked Bass from vst4free.com/free_vst.php?plugin=Project16_Picked_Bass&id=2320
Reverb to lessen the percussive sound. You can twiddle the sustain in Project16, but it starts to sound like a cello.
A Marshall amp plugin set to full gain and middle, no bass or treble.
NadIR or other stereo impulse response loader set to mono with Marshall 4x12 impulse and the same with the impulse moved to the left in Audacity to lower the frequency response to that of a theoretical 4x15.
Use at your own risk.