I decided the autotensioner for Civic SI would be a good setup for this blower setup. Here are the part numbers needed. Thank you Greg for pointing me to this great product!!!!

Tensioner Assembly Parts 354-200 - This part # orders all the below parts
□ Idler Plate 354-201
□ Adjuster Plate 354-202
□ Idler (7 Groove) 354-203
□ Bearing 6203 352-012
□ Snap Ring 352-013
□ Adjuster Lug 354-204
□ Stepped Bush 352-019
□ Idler Pulley 806-080M
□ Set Screw (M8x1.25x40mm) 802-5009
□ Black Oxide Hex Nut (M8x1.25) 803-1027
□ Flange Bolt (M8x1.25x60mm) 800-3021
□ Flange Bolt (M8x1.25x70mm) 800-3031
□ Flange Bolt (M10x1.25x80mm) 800-4022
□ Flange Bolt (M10x1.25x75mm) 800-4016
□ (2) Flange Nut (M10x1.25) 803-1041
□ AC Line Bracket 354-206
□ Flange Bolt (M6x1.0x12mm) 800-2001

Look at the belt wrap. In addition to getting to use your OEN tensioner you also can keep your belt within spec as it stretches.

Here is a link to the Civic SI Install pdf. Its for their whole blower install but by step 17 your following the instructions to get this piece installed correctly.