I used an electric PS pump from a mid 2000s Volvo s40. Cost me $20 from a junk yard and works great. Way easier to find than an MR2 pump. Hardest part was making the fittings for the rack. Had to silver solder AN fittings to the existing brass connectors.
The tensioner was from a 2004 v8 Touareg. Same engine, just slightly different layout with a shorter tensioner for better clearance. You may not need it, as I was trying to get away from needing the upper idler, but it put the tensioner on the wrong side of the belt that way and the clearance was really tight.
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