That would be about 80ns per clock or 12.5MHz SPI bus? And you're driving it over 1.5 meters of a completely unshielded or otherwise balanced 0.4mm diameter wire? Looks like the rise time is about 8ns or 125MHz effective. Ouch.
Theoretically that'd add up to about 200 ohms characteristic impedance so your translator driver should have 180R series resistor to the clock and SDO (MOSI) lines. If you're actually reading data back then you have to add another resistor to the SDI (MISO) line at the far end. If the driver can supply enough current, you can skip the series resistor and add a 200R resistor to the GND at the far end for best effect but this requires 25mA drive which may not be practical.
Depending on how the cable is put together the actual impedance may be (much) less, depending if there is wire right next to it (<<5mm). Experimenting will yield optimal value, start with 47R resistor in series and work your way up in increments of 47R. Alternatively 22R and 22R if you want to fine tune it but it's probably going to be "close enough" with 47R increments.