There aren't a lot of companies making 235mm cars. The focus is on WGT (200mm pancars with 1S lipo)
Some small manufacturers offer a 235mm carbon chassis so you can use other brands parts. The great thing is that those chassis are unique and you can use whatever parts you want. As 1/12 pancar parts also fit you can design the chassis the way you want.
What you also can do is to use IRS hubs to extend the WGT cars to roughly 230mm at the back. A rc10R5 with some aftermarket front suspension plate and the IRS long hubs is roughly 230mm without changing the bottom pod plate. A small conversion would be needed to fit a 2s lipo in but it has been done already with succes.
The X-ray link can also fit 2s lipo and with the IRS hubs and a wider front plate it can be converted to wide spec. Usually the ones that have done that already are willing to make those parts and sell them.