This is Yokomo BD10 Series Front Belt Tensioner Set. A tensioner installed under the front belt for the BD10 series to suppress fluttering of the belt and improve drive efficiency. For touring cars that use a spool on the front, the underside of the belt tends to be loose, so replace the PCS block in front of the motor mount with a tensioner mount.
For: Yokomo BD10 Series
Yokomo BD10 BD11 Series Front Belt Tensioner (1 set)