I couldn't find separate part numbers for front springs or stops, either. Which is unfortunate because the stock front stop is dimensionally identical to how I trimmed the rears. Coincidence? The front stops appear to be a slightly firmer material, though.The front bump stops are shorter, so those might work as replacements for the rear shock. But the Tesla Parts Catalog only lists the rear bump stop part number, so it looks like those front bump stops are only available with purchase of a complete coil-over shock assemblies. Since KONI does not include new bump stops or shock bellow bottom perches, not a good solution that I know of.
The good thing is that these things aren't rocket science. There are aftermarket options available from a number of sources, plus a whole ton of different OEM varieties. They're a really useful tool for tuning the "feel" of the suspension, and how it reacts to things like trail braking. BMW (for one) has done a LOT of work in this area.
Below: Model 3 front, Model 3 rear, BMW E36 rear "sport", E36 rear "standard" (trimmed).