Kuryakin make some some nice adjustable 5 position and 3 position versions that fit front or rear with small splined adaptors. They have a Premium Chrome and cheaper Plain Black versions.
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I use them on front but have a as new spare set with rear splines adaptor #8808 too. You can get Kuryakin adaptors for front or rear splines or a version that does either.
RIVCO made 2 versions but both out of production for years and all old stock well sold used or private sellers only now. RIVCO do have a relocation extender for their oqwn borads which is still available.