help with coolant system part identification Oem Parts Or ???

Wanted to replace the plastic bits in the cooling system like the tee and reducer because I assume they are as old as the car. I was going to replace these last year but the better half nixed any more spending on the roadie after a lengthy/costly list of opti and opti related parts.

I ordered what I thought was the whole assembly but it doesn't match what's under the hood. There are parts I cannot find on any cooling system diagram or parts house.
There's one on each heater core hose, one black and one grayish.
The assembly doesn't exactly fit with what is there. What the hell are these things?

they are aftermarket garden hose couplers for flushing and changing antifreeze

Yep, that is exactly what I was afraid of. Thank you.
They reminded me of the fittings on NASCAR cars that hook up to the rolling cart to cool them down.
Are the heater core hoses half inch inside diameter?

All sketchy plastics removed, 1/2" copper fits to bridge the cut heater core hoses.

500 miles later and all seems well even if she seems to be running a little hotter than normal.

You might want to check those copper connections after a while. There's already aluminum and iron in the system, so neither of those materials are going to be problematic- but copper may be more reactive and set up a galvanic reaction. I'm not sure which way it'll go, if it'll tend to dissolve the copper or if the copper will accept ions from the other metals and get crusty. But, again, it may be worthwhile to check and see to make sure you're not doing any damage.

Obviously the plastics are electrically non-reactive and anything that's already aluminum or steel would be fine.