I have found the Losi LST1/Aftershock to LST2 upgrade kit. Take a look, hopefully it will show you all the parts that are different
http://www.modelsport.co.uk/index.php?product_id=24598&gclid=CjwKEAiAoo2mBRD20fvvlojj5jsSJABMSc7jnAjEfCNHqiayp0TNyoq_8KbYKSU_m8C5pxEIW0m6uxoC-57w_wcB