Hey guys I am putting my motor back together after getting to back from the machine shop and have new o rings for the fuel injectors. I understand the o ring replacement but there is also a plastic type ring that comes with the injector o rings. The old plastic rings on the injectors have a break to them where they can be slid off the injector. The new ones do not as in they are complete solid around. Do these break when sliding onto the injector or am I supposed to cut a slit in them to slide over the injectors? What is the deal to installing them?