Back up a step and ask yourself where these parts come from. Neither 440Source nor Mancini has their own manufacturing facility. The parts are sourced from somewhere and as they're both in the business of making money, they have to get their parts from someone who makes enough of them to have economy of scale.
This points to both parts coming out of the same factory somewhere, and it's probably in China. I have no complaints about that. The number of Americans who want to work casting parts has dwindled sharply in the last 40 years. Of course there are nearly 100 million adult US citizens who aren't working, but just try to get them near a foundry!

So I'd suggest saving the money. If you feel for Mancini, send them a check.

R.