This is the arrangement I have got for the mud guards ,and adjustments
Thanks for pics, you have some front cycle wing brackets on the rear which is non conventional.
These brackets are a right pain and the welds always snap, it happens to more or less every Freestyle at some point. I have welded mine up twice and beefed it right up the 2nd time. Every pot hole you hit sends huge shock loadings through these rigid brackets.
The only reason to have a cycle wing setup on the front is because the wheel turns. As the rear is fixed means the arch can be fixed and you have some good brackets that can be used here and puts them on the sprung side.
It looks like it may be a non original Freestyle rear arch or may have been chopped, also looks likes there is some damage to the fibreglass which can be fixed easily. I spent a while restoring all my fibreglass panels including the nose cone.
Several options, the freestyle rear arches are rarer than rare so if you did want these you would need to make a plug and than lay up from an existing set, just need to find a Freestyle local to you. If you did manage you could probably reproduce a few sets.
You could repair the existing cycle wing brackets probably as an easier option, just grind back the welds and beef up as best you can. On mine I can sit on the front mudguards they are so strong.
The fibreglass damage can be fixed by applying some resin on the underside then a few patches of glass chopped strand mat and then cover with more resin. Once dry apply filler, sand and paint. That's the best thing about fibreglass, messy but easy to repair. As a starting point you need to drill out any cracks otherwise the cracks will keep going.
The design can be improved further by fitting some adjustable front and rear.