Some differences between the 16FP4 that was in there and the 16LP4A going in, aside from slight difference in deflection angle and the shape of the bell,which can be adjusted for, is that the 16L has aquadag coating where the 16F did not, also the 16L has a newer type anode connection than the 16F, which it no big deal because the HV line was trashed and had to be redone anyway.
And the final difference is that the 16F had a single pole ion trap where the 16L needs a dual, and I do have a NOS dual one that I hope will work, never used, not sure for what tube it was made for.
https://imgur.com/r3Yt9S5
There is an arrow on the top of it, I assume this points to the screen?