That's interesting. I assumed that as an MPV, the Multipla had a unique chassis, or shared components with a compact van. From the look of that, it seems that the rear subframe is more or less straight from the Tipo, with the arms remodelled to provide the wider track. From the line drawings, it looks like only the bushes are different. This would explain why bushes made for a 155 will fit, and I'm sure these Tipo ones would too. I'm wondering though whether the difference is to do with vehicle weight and centre of gravity, so those made for a lighter, lower car (standard spec) would not be appropriate.
Have you replaced the trailing arm kit? I have play in mine on one side so bought the kit and gave it to my mechanic to fit for the MOT. He couldn't get the arm off to fit it. Fortunately, he had put the car in for the test before doing any work and it passed, so this isn't a great problem.