I too spent some time trying to find an idler gear to go for a belt conversion but after not finding one I simply went with the 2 ball diffs (parts 107 and 108 I think?) and a standard belt.
My Optima has been fine without the "official" conversion or even the post fitted idler conversion.
If you find my thread on here about my optima rebuild there are some really helpful posts from other optima drivers to help with either doing the conversion or sourcing the parts.
I ran initially with a 17.5T motor but have used a 13.5t for the past 6 months with no ill effects
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I've got Araldite and a Swiss Army Knife - what more do I need?
Yokomo YZ-2
No 4WD because nothing lives up to my original Optima. Until now maybe?...
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