If you prefer a threaded thru-axle, the following item will work with the stock fork on the Delta X:
https://oldmanmountain.com/product/front-thru-axle-suntour-q-loc-compatible/
If you prefer a threaded thru-axle, the following item will work with the stock fork on the Delta X:
https://oldmanmountain.com/product/front-thru-axle-suntour-q-loc-compatible/