Get a good look at what the dropout looks like, head to eBay and buy a $2 one.... from CHINA though.
My 2 boys were smashing them regular, I bodged up $2 ones each time, had 3-4 ready to go, lucky as one of them smashed one in Tassie.
https://www.ebay.com.au/itm/KE-1PC-...hash=item3d900973cb:m:mPkNizM8EFZnhi0Cs0U-Zbw
Just had a look, got these still, I'll send you one but it looks like you will need to do a bit of filing to get it to fit. The offset is is the right direction, spacing of the 'hole' looks close.
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