Hello and a very warm welcome from another 350/4 owner. You might already be aware but lots of 400/4 parts are the same - look for the '333' in the part numbers for 400. I have 350, 400 and 550 fours but I think the 350 is still the best of the bunch - for my needs at my age anyway! Shout if you need any info - lots of that on this very helpful forum.
Ian