VY Ecotech Idler Pulley Which Way Does it go on

[wortus]

I've just removed the idler pulley from the front of the motor , the fixed plastic one mounted just above and to the left of the air conditioner compressor to check the bearing and noticed that one of the raised edges is higher than the other one and not sure which way it goes back on, can someone check theirs and advise me urgently please?
I suspect the higher of the 2 sides goes to the rear?