Was having the same problem as you with the struts. To many questions when you go to purchase them. What's the compressed length, what's the extended length, what's the pressure you want?

Unlike you I had a new cabinet door made where the front tv used to be, so I had nothing to go on with this experience. You on the other hand could probably contact the mfr. and they could direct you to a place where you could get them. You may even be able to purchase them from the mfr. Give them a call. As for me I'm still looking but I'm sure I'll find what I need some day.