Gas strut for trunk. Help needed

I need to find a gas strut that will hold the weight of my trunk deck lid. That one that on there now worked for about 2 days but never had enough pressure to push up and it would barely hold it in place. It's a cheap ebay style. I'm attaching pics of it with this post.
From the center of the bottom pivot to the end of the body is about 10.5". Any longer and it will not compress short enough to work. Would be nice to get one that had a thicker body and more pressure. Any ideas how to know what to buy and where to find something that will work? Let me know what more information I may need. I do not know the weight of the trunk deck but am working with a 66 dart.
Will need to do the same with my hood as I've changed that over as well. I can weigh the hood as I have a spare one here.
Thanks Rod

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Did you know there's a write up on this in the "How to" section here. Check it out, looks to be very good.
It's in the body work area towards the bottom of the list.