What is the type/spec of the power cord?

The power cord plug on the amp side seems quite unique and different from all the other brands I have had. If I am going to get a shorter length replacement, where do I look for?

It’s a regular IEC socket?

Yes. But it is not the usual C13 with 3 pins here in north America. It is the C17 type instead.

Yes, but C13 works with it very well.
It’s a class 2 device, so doesn’t need earth wire/grounding.

I tried a lot aftermarket power cords and the provided is not bad. BTW no need for the third earth cable, there is not connection inside the amp.