DontTellMyWife pointed to this INA pulley as a direct replacement pulley for the tensioner pulleys.
https://www.m3post.com/forums/showpo...7&postcount=44
INA 532 0342 10
Diameter [mm]: 70.00
Width [mm]: 26.00
$20.99 on FCP
https://www.fcpeuro.com/products/bmw...li-11281440237
$23.00 on Amazon
https://www.amazon.com/Drive-Idler-P.../dp/B00FBQM344
Link on INA's catalog:
https://aftermarket.schaeffler.com/e...312-5320342100