Good info with that list of parts in pdf form but I would be wary. They don't seem to understand the G60 didn't come with a P40 but rather the P engine. They also are listing timing chain for the P40 which is way wrong. P engine does not have a chain it has gears, P40 has a chain though. P engine is 1960-1979. P40 is 1980-onward. You would think a supplier of parts would know this and if you bought the timing chain stuff, had it sent all the way over here that would be a big waste of money.
Absolutely dislike the stock gas caps. They are cool looking and I like original but I opened up a box the other day, NOS cap in it that was not cheap at all and the key cover fell right off. Disassemble the cap to find it has hardly any flaring on the pin that is supposed to hold the cover on. After 50yrs, sure they wear out and need help but an NOS cap that cost mucho $$$, big disappointment. Now I have to drill and tap it, not looking forward to that since it is so darn small. 6-32 tap is even to big, going to have to try and order something smaller.
Great info here
http://www.datsunparts.com/2148But NOS cap I have has a leather sealing seal not cork or rubber. There is a place that still sells NOS caps, I believe they are for the roadster but they are very expensive and you may end up dealing with what I got to deal with after shelling out big bucks for a new cap.
Cheers