1/35 sdkfz 7 8 ton half track engine upgrade set

Hi, i’ve got the Dragon kit (early version) but am aware that the engine details may be lacking. Want to display with louvres removed/partly open, so an upgrade set is needed.

I know Griffon used to do one but i’m pretty sure its not available now.

If anyone knows of a decent upgrade set for this kit, that is commerfcially available, i’d be most grateful for your reccommendations.