This says it's for InStep?

https://www.amazon.com/Mofeez-Bicycle-Trailer-Attachment-Trailers/dp/B07KVV79QN/ref=sr_1_1?dchild=1&keywords=in-step+12mm+bike+hitch&qid=1591845311&sr=8-1

If that's not the right kind, describe your trailer hitch. Post a pic if you can.