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Looking for idler pulley 2105380SM

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Hello all,

I have a new to me 36 inch tiller. One of the idler pullies is seized up it looks like it's part number 2105380SM. The pulley measures 4.5 inches with a 1 inch bore with a set screw. The dealer gets $93 for it, are there any other options for this that other people used?

The tiller is a 1690039 I'm looking for part number 28.

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SEPW shows it for $77. I have seen a couple of alternate fixes. Putting a nut or threads in the tube to be able to secure a more generic idler in place. Have also seen a bearing with a locking collar and a generic plain pulley like one you weld onto a hub. 

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