That's a fair question, which needs a detailed answer. In short, I have never fitted a gen bezel and insert to an SD with a stock crystal. It might just be doable, but I'm not sure about that at all as you have to remove some of the case where the crystal and gasket fit, it will be very close indeed.
The crystal mod can be gen or generic, no difference in size.
The gen tension ring will not fit a BP SD, it's too small.
If you are attempting this,be warned its very very easy to mess it uP. There are three areas of the case you have to work, all must be done correctly or you will scrap either the bezel or the case. I've done a few of these and they still take me above a day to do and I have the machines to do it
By hand I wouldn't even attempt it.
Hope this helps
Thanks for this mate i know this is a good question, and it's rare to find someone really competent to answer like you
Unfortunally seems that the job is not really simple and cheap, This is a pity beacuse i had found an unrepeatable offer on bezel ring