Question about 250 power steering belt.

[Jim Boy]

Hi folks. I have a 250 with A/C and am installing power steering. I have double pulleys on crank, water pump and alternator. I have a spare groove on the alternator and was wondering if I can run the power steering from that groove which is in line. when trying to figure out another way I get dizzy! I was wondering about the different size in the pulleys and if it matters. I have searched for pictures of belt routings but can't find any with A/C included. Of course as in the past all help is greatly appreciated. Have a nice day and thanks in advance.