Glass replacement for Velux GGL - 4?

I have one that is cracked and called Velux and was told I was out of luck, it's no longer available

*I also have two Velux GGL-6's and one GGL-7 as well, installed in 1986. Velux said they no longer have parts for these older units (I was looking for a new control flap and the price for glass just in case). They did say that these center-pivot roof Windows are still made in Europe, and that I could order a new unit, shipped from Europe. As far as glass goes, you may be able to have a glass shop install new panes of glass and rubber seal on the existing glass frame.