Hi, was wondering if there's a part number for the little plastic spacers that are on most of the A/C pressure hoses. I'm replacing the whole system, and most of them were so brittle that they snapped off when pulling the hoses out. Here's a pic of what I mean (it's the yellow plastic spacer, not the o-ring):
Are they necessary to maintain pressure, or can I use something else to replace them?
Thanks

Are they necessary to maintain pressure, or can I use something else to replace them?
Thanks