GP100 Wiley Clapp help needed

[wapner]

Hi, been reading here a while, finally joined to ask a question.
I have a GP100 WC SS version. Mine came with the tall front sight, Ruger sent me the low one which I'm dying to get on. How would you approach this? I'm worried a pusher on this round barrel will slip, or use brass tap? Anyone that has done it ANY advice please as I dont want to F this up.

Also can anyone verify a know fit adjustable rear replacement.

Thanks!!