Replacement of Truth Maxim Dual Operator .... detach-clips needed?

Hello,
( I ordered a replacement for my awning operator last week....installation was a breeze and it works great....thanks! I want to tackle a couple other windows now.....)

I have a Truth Maxim Dual Arm operator, stamped "Truth" and "41012" on the arm identifies it.
This is discontinued, but you recommend Encore 39-253RB to replace it.

The operator we have does not use "detach clips". It is not clear to me if there is some kind of clip or filler/epoxy that is used to keep the arms from sliding off the snap-joint. If I order a 39-253RB will I need to also order detach-clips to keep the arms attached? Or will the arms snap onto the studs without needing to add detach-clips?

Thanks!

I am uncertain on how the replacement arm will stay attached. If the arm snaps into place without any additional suppor: that's what I need to know. Thanks!