Any 25mm timing belt will do as long as it has about 145/146 teeth. The tension idler will make up the difference.
I purchased a 146 tooth belt from BSC in SA for around $25 IIRC.
Leads me to ponder though.... has someone got the measurements of the 1J & 2J cam gears? How much difference to the 1G gears? There is a number of 2J adjustable gears on EGay, might be a source of 1G gears if similar.
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