I have a GTX 660 and a couple of big old 21" Belinea CRT's at my disposal and I'd like to use both monitors, but the video card has a HDMI port, a display port, a DVI-D port and a Dual-link DVI-I while the monitors only have analog 15-pin VGA inputs.
Now I use a DVI to DSUB(VGA?) converter to connect one of the monitors and it's working fine, but as I learned, the other DVI port is not carrying an analog signal, so I can't connect my other monitor there.
You will need an active converter to convert an HDMI or DisplayPort signal into a VGA signal. For bandwidth reasons, you will probably want to go with a DisplayPort to VGA connector rather than an HDMI to VGA connector. Both of those converters that you linked seem to be limited to 1080p though.