im not gonna argue with anyone on this just stating the facts if u dont want trouble spend the cash on a tested cp-e pump.
The simplest statement is I have spent like way way way more on the rest of my mods to cheap out on this very important part and have it bite you in the ass in the end. its bs trust me my friend
If u still insist on being cheap and chance taking which could leave to pulling ur pump and putting stock internals back in possibly once or maybe 10 times like i have lol, then goto Ken@Protege Garage he will give u good prices and great service at least