I modded a back to front bender fender XL to fit mine but it was a pain to get it to fit correctly. Eventually I managed to get it to work by trimming the front (the back part for a normal fork) off as it just stuck up in the air, creased the front lip in two places (just beyond each side of the tyre) to give a boxier profile to the front, punched a new hole to fit the velcro through to the arch and then twisted the arms around to the front of the fork lowers (90 degrees from where they would normally be) to get the back to stay down.
A bit of a faff but it works and has done without complaint for 18 months like that. If I could have found a sheet of the plastic used I’d have made my own but it all turned out fine in the end.