Hi all, I came across those strut braces (I and II) while browsing the web, searching for parts for my X1/9. I first emailed Henk (the store's owner) to be sure that, once in place, the front brace doesn't interfere with the storage of the targa top; once it assured me that it wasn't the case, I've ordered both braces. They arrived about a week later, the installation was a breeze, they bolted right in place on my '81 X (and yes, the top still fits nicely in the front trunk). Man, what a difference those braces make! The car is WAY more stiff, the handling is really improved. There's less chassis flex, especially during cornering. The ride is still comfortable. It's almost like I got a new car . I think it's the best 400 CAD that I spent on the car so far. I'm not affiliated or any way associated with X1/9 Parts Holland, I just wanted to let you know that thoses braces did the job for me .