Had the same trouble with finding a lower ramp for my World Cup Soccer. In the end I had to repair the existing one by cutting and sticking clear Mylar under the cracks and also doubling up broken tabs. Good luck with your search fr a ramp!
Yeah they appear to only be stress fractures so far. Thats actually a really good idea. Hopefully if I throw some mylar on there it can soften a bit of the blow and at least slow it down and give me enough time long term to find a new ramp.
Worse comes to worst I have been investigating my options to reproduce the ramp itself. It would seem this may be an expensive way to go but long term if I want this thing to shine I think it would be worth it.