Jeff Rowland 725 monos - best power cords?

Any Jeff Rowland 725 owners out there who have experimented with different power cords?
I am still using them with the stock 20 euro cords as I do not have any power cords with c19 connectors (20A) on the equipment side...
Not many shops here seem to carry them either...
Any recommendations, comparisons from users would be greatly appreciated...

Also as my amps sit far from the wall I am running them of an audiophile multisocket extension block, would it be better to get very long cords for each to the wall directly, or will a decent cord to the extension block and start from there with shorter good cords work?