I will include surprisingly well-written instructions, but this is at least mildly complicated, and you should know what you're doing and have a decent soldering iron. This kit will fix many issues with the ECA-101E, but I would strongly recommend cleaning the controls and tube sockets with Deoxit D5 or a similar contact cleaner.
US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.