So what are these gizmos

[dude99]

I've searched with part numbers but can't find anything.

This guy is the same as the one on the return line, however this one was puking fuel. I could see right through from the inlet to the outlet so its not a check valve... has be stumped...
fr_292_size880.jpg

And then this little box on the passenger fender has me vexed, there is an old siren under the hood so I'm assuming at some point there was an alarm, was this part of it???
fr_231_size880.jpg

[MIKYZZ4]

Those are some sort of pulse dampners for the fuel. They are no longer available and not needed.
That other one looks like an alarm/horn relay.

[8991XJ]

The fuel pulse damper are removed and not replaced when they leak or the fuel lines are replaced.

With a regular screwdriver head that would be an aftermarket part in the second pic.

[dude99]

Excellent, thanks. I'm doing a single pump conversion with all new lines so both dampers will be binned if they're not needed, less chance of leaks. The little mystery box will be binned also if not required (although I might crack it open to see what lurks inside out of curiosity.