A way the pin style relay works with common test leads for quick checks.
2 New Zettler Sealed 5-Pin NO/NC Relays 12VDC 40A/30A 125-250VAC AZ2100-1C-12DE
You will find that 70*20*18mm / 2.75*0.78*0.7" makes placement straightforward.
You will find that the Relay Bypass Switch Kit works well for quick bench tests and field repairs.
This Potter & Brumfield relay looks clean, with tidy contacts and a coil that seems well sealed.
You will find that the Potter & Brumfield unit fits standard sockets with a snug, reassuring click.
I keep coming back to the model 301-1C-C-R1 U01 12VDC for steady results.
A nice touch is that the brand is Deltrol, which I have relied on before.