i was just doing work on my bike yesterday at a nearby coop store and we replaced those brake lever adjusters with just a standard pair of cable holders but do the original cable connectors provide an advantage? To be honest, I started by taking everything apart and setting the bits aside and then by the time I started to put stuff together again, I forgot what went where!!! Typical rookie mistake and I should have known better.

I have those 2 parts still and can always replace them if I need to as I still need to add lever hood covers.

My stem also looks like that.