Repair my 105.012 pushers

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hello
I had last year for gift
A 105.012 1966 HF case
Top caps of pushers are gone
Pusher was genuine pusher

My questions are
Should i mount genuine pusher or serviced pusher(086ST0089)?
If i fix it with serviced pusher now, Will i able to fix genuine pusher later on this same case ?..

Sorry for my english
I hope you ll understand