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As you say that number is supposed to be 283
I might be stating the obvious,
When measuring , because the two holes are different dia you can't just go inside to outside .

Measure outside to outside PLUS inside to inside DIVIDED by 2.

IF they are indead wrong and difficult to send back due to your local , modifying them would be simple matter of moving the axle end the 5mm.
Weld washers on in the correct position then file the hole.
 

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Well, if you are putting in a pair , my recommendation,
Make sure they are the same ( the pair )
Compare to the original arms length.
Either ,
• Just put in and try ( worst MIGHT be harshness on accel )
• Go through all the crankshaft- driveshaft- pinion angle checks to find the optimal arm dimension
• Modify the arms by stitching washers on and move the holes.
 
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