Hurd? Block risers?

A home owner from New Berlin,WI says:
Hurd block risers?
User submitted photos of a window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
I'm not sure we can supply this block ramp. This exact type may not be available anymore. We carry the 67-020 block ramp, but I don't know if it can work as a substitute.
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