The link I previously used was for XT 90 connectors as it seems no-one actually makes anti-spark connectors in the XT60 size.
- Here is a pair off a UK seller on Amazon for £5.50 - XT90 Anti Spark.
- XT90 connectors on Ebay
Otherwise if you need some extra spark/short protection for your XT60 connectors then getting some plastic XT60 end caps.