Which set is this 2 x 6 slope with holes from? I picked up a bag of loose LEGO at a thrift shop and cannot identify which set this piece comes from:



The holes pass all the way through the slope but have small details inside that prevent a standard technic axle from going through:



If anyone has seen it before, knows which set it comes from or what its purpose is, please let me know. Thanks.
You have a Fabuland Roof Support Slope, 6 x 2.



If it's like the similar ones I've seen in Duplo, it probably came pre-assembled into one of these:

Fabuland Roof Support with Gray Roof Slope without Chimney Hole



Fabuland Roof Support with Red Roof Slope with Chimney Hole



Fabuland Roof Support with Red Roof Slope without Chimney Hole