chris3 wrote:in 1:16?
Well, Billpe didn't specify that.

The E-25 kits available are 1:35 I think, definitely not 1:16.
As for whether they would've used panther / KT idlers and sprockets - maybe. However, casting smaller ones really isn't that much extra work, and all the media I find of E-25 has a very small idler, though one could argue the sprocket is Panther sized, give or take.
JagdPanther / Leopard 2A6 / StuG Ausf. G / KV-2 / M4A3A4 / MTLB / 2.5 ton truck 6x6