If it is a buggy, there are no front body posts. There is a tab on the top of ECX1029 top plate. This tab goes through the body nose and gets pinned down. There is a single curved mount on the rear shock tower (front of it) that gets one pin. Attached to the back of the rear shock tower should be two tabs for the rear wing.
If you don't have any of those provisions it's a monster truck Ecx231025 is the H shaped adjustable body uprights themselves, specific to AMP monster truck, Brutus, and axe. “Body post set”
Ecx2009 is the body post mount that attaches it to the front shock tower, this has more cross compatibility - amp mt, axe, Brutus, crush, torment, ruckus - 1/10 2wd versions
Both are only available as front and rear sets. Not much aftermarket for either, Hot Racing used to make a carbon fiber and aluminum body post set
Just punch the part numbers into google, some stores still have some new old stock and ebay typically will have a seller or two. There is a lot of interchangeability between the 1/10 ECX 2wd lineup so parts should still be around for quite awhile even though they are discontinued.