Raider/Fireball mod - plastic spacers

I’ve been getting into 2A a lot more so I wanted to grab myself a pair of Fireballs for modding.

I was browsing through two Japanese stores and I noticed that there are two kinds of plastic spacers: the white plastic spacers and the black delrin spacers. Is there any difference between the two? I don’t know, one requires sanding and the other one doesnt [I don’t know…just guessing]?

I need your help. Thanks.

Don’t know the answer to your question off the top of my head by if I recall correctly this guy explains the differences between spacers and how to mod a fireball.