That (restricted) list was a result of a discussion on here a few years back. Everyone is always aghast at how much stuff is on the list, but it's basically the same list on every sports car forum with a few things changed for the model of car being addressed - For instance, many drivers of British sports cars often choose to carry along a much larger fire extinguisher 
So here's the list from that old discussion, with a few words of advice: Choose what to bring that suits YOUR car because a lot of our 356s are unique in some way, like my electronic ignition not only is unique, it is no longer in stock and you can't just pop a Bosch 009 in there and expect the coil wire connector to be compatible.....It ain't.
Same for a bunch of other stuff, BUT, there is also a lot of commonality across all of our cars (think light bulbs, etc.) and some of the spares are generic. Also, what you choose to bring for tools and spares will depend on your mechanical ability and how much you can fix on your car, alone, at the far end of a state park, near closing time, like Joel. Honestly, I've met Joel and Barbara, his wife, and I believe he can fix anything, kind of like MacGyver. This time he had everything he needed, just in case, and it paid off.
Also, decide how far you might journey from home when planning spares/tools, too. If you're just bopping around town then you need a smaller percentage of "X" stuff. If you're planning cross-country treks over 50 miles from home, then you're gonna need "X+" stuff, especially the things you can only get these days from CIP1 or CB Performance (although NAPA continues to surprise me in what they carry or can get that day).
Here's the link to that old discussion, gotten from the search function: