The only exact fit harmonic damper (it's not a balancer) is BHJ: $$$.
I thought this topic was/is about finding a 235
crankshaft harmonic balancer?
GM Group Number: 0.659
balancer, crankshaftSome might use a different name, but, no need to confuse someone who is using GM manuals/terminology.
(step 11, for another example)
damper/balancer would be an ok designation for this forum and this question and this suggestion?
Nonetheless, as you posted ($$$) $475 + $35 shipping for that new harmonic damper would have me looking for a good used harmonic balancer.