If your body has broken, you could possibly buy this as a replacement.
From OnBuy
TAMIYA 51401 Lancia Delta Integrale Body Parts Set (TA01/DF03RA/TT01/TT02/XV-01)
Model Bau
Tamiya Lancia Integrale Body 51401
Conrad Electronic
Tamiya 51401 1:10 Car body Lancia Delta HF Integrale 186 mm Unpainted, uncut