first, is there any alphard 200? or did you mean 2004?
secondly, even if the spring fit/compatible each other. i still didn't recommend it since it is not suitable in term of bounce rate, hardness and height. both is different type of vehicle. so not advisable.
Recently i've read up some articles, found out a good IC SHOULD not only lower down the temp but also to improve flow which shld be the factor if we ever wanna change it.