Conky - string formatting

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http://unix.stackexchange.com – I have conky the record: ${color lightblue} Down: ${downspeed wlan0} Up: ${upspeed wlan0} Conky prints link speed, but the text moves: Down: OB Up: OB Down: 60B Up: 60B Down: 148B Up: 148B Down: 1KiB Up: 1KiB Down: 1.8KiB Up: 1.8KiB Down: 1.08KiB Up: 1.08KiB Down: 31.8KiB Up: 31.8KiB Based on this topic Creating Conky text variables with zero padding? I tried to format the output, but the text still moves. ${color lightblue} Down: ${lua_parse format %7s ${downspeed wlan0}} Up: ${lua_parse format %7s ${upspeed wlan0}} I want the printed output conky: Down: 0B Up: 0B (HowTos)