I thought the 115 aet was a 2 stroke engine, can you confirm, unless they used the same model number for the 4 stroke as well!
Easiest first, I found the parts book for the 703,
Switch assy is 703-82540-00 just for everyone's reference
There are a few parts for the friction assy which are refered to as bushngs or spacers and aren't clear enough on the pictures to be able to identify your part. I will try and email you these pages if you want and you can have a look and get which numbers you need.
As for the fuel pressure regulator, I'll have a look today for you, could do with knowing the year tho mate and the serial number maybe?