Replace Vynyl glazing bead on Anderson Narroline windows

I'm not sure what to recommend. Take a look at the 55-301 glazing bead, which is used on 5/8" thick insulated glass. Also look at the 55-310, for the older Andersen windows with 3/8" thick insulated glass.

Check in between the panes of the insulated glass and take note if the space between the glass has a metal spacer. If so, then it would most likely be 5/8" thick. It the spacer is made of glass (a glass seal) then the glass would likely be 3/8" thick. That is the rule of thumb on glass thickness for this kind of window. However the only really way if to actually determine the thickness is to physically remove the glass from the sash and take an accurate measurement.