Hello Craig, I have a New 028 T harmonic balancer. Never used it.
Also in the hoard I have an 037 pulley for 9.5/10mm wide belt that might just be a tad smaller diameter than the 028. Fits perfectly into the balancer.
make an offer on the 028 T harmonic and the 037 is free, if it fits, awesome.
Some pics and measures...




