Available on order through your local bike shop:
https://www.jbi.bike/site/product_de...t_number=27439
Or for something "beefier:"
https://www.jbi.bike/site/product_de...t_number=28632
Beware that some of the "beefier" forks offered have different threading and crown race diameters that might require a new headset. Let the shop measure your trike to make sure everything fits.