Available for pre-order (20% off until July 31st) smithoffgrid.com This is a bike trailer hitch I designed for the Talaria String and the Surron Lightbee X. Works great for pulling a kids bike trailer or a cargo trailer as well.
But if you want to be sure, you can check the dimensions of the flex connectors from the photos on the product page and make sure it’ll fit in the shaft of your specific trailer. smithoffgrid.com/products/talaria-trailer-hitch
I'd love to see if the talaria or surron brackets would fit but I haven't been able to get my hands on one locally yet to check. But I can let you know when I find out!