voltage reg problem

[MacataQ]

Okay... given all the confusion over the VR and the rats nest of wires by PO, i am going to just convert to a 1 wire system. any recommendations for a good make to get? not needing anything high amp, only running electric fan, stock-ish radio & have converted all lights to LED. thanks

GOOD DAY ALL
i have spent the day going thru a ton of posts on Voltage Regulators
and i cant seem to find anything that covers my specific problem. hoping someone here will set me on the correct path electrically (pardon the pun)
1972 c10
SBC 350
3 wire alternator w external Voltage Reg
no A/C no pwr win, stock radio
details
low charging voltage @ bat when go thru stock reg -by pass reg (test) alternator pitting around 14.9 15.4v
i believe this test confirms the alt is okay?
so i suspect the VR
so went online Napa Canada out in my vehicle details and was directed to
purchase VR142SB as exact fit for my truck, so i ordered it.
when i got it a became perplexed
i thought it would be a matter of plug and play .."as in EXACT FIT"
but it doesn't look like it to me
see pics
any ideas?
thanks
Mac