Tirechains.com recommends the X type chains for rear tires on R4's. I think they would be a bit easier to install (if easy is the right word) than ladder type which are a bear to install on those tires. For the fronts, if you use them, tirechains.com recommends the ladder type on the smaller tires.
The ladder type get caught in the deep treads and require a lot of finagling to get on decently. Going into the deep treads, also, of course, defeats the traction you want out of the chains.