Your TT-02 in it's current form with a 257mm wheel base, your spoilt for choice. Majority of 1/10 shells are 257mm WB and 190mm wide. Iff you go 200mm width then your looking at buying wheels with a lot of offset to fill the arches. The TT-02 also allows for a 251mm wheel base by flipping the rear upper and lower arms. I haven't explored shells with 251mm WB bodys but the RCON RS200 shell fits with a 251mm WB, even though it's listed as a 257mm shell, I found it fits better with a 251mm chassis.
RCON RS200 SHELL
Here's an RS200 shell sat on a 251mm TT-02 chassis.
To keep things simple, stick to 257mm WB, 190mm wide body's with 26mm wide wheels There's plenty out there