Hella sells the Vision Plus lenses which have the replaceable bulbs but comply with DOT using the 3 "alignment pins" on the glass, typical of sealed beams. Not sure how the beam pattern of these compare to the true E codes.
If you want ECE Hellas for your 83 300D, I recommend these:
https://www.amazon.com/Hella-Halogen-Replacement-Headlight-Standard/dp/B000FKIURK/ref=sr_1_4?ie=UTF8&qid=1484036923&sr=8-4&keywords=hella+7+inch+h4+headlight
Be wary of these ones below - the beam pattern is not correct for North American driving (cutoff is on the wrong side):
https://www.amazon.com/HELLA-002395991-Type-Single-Headlamp/dp/B0002M9QJM/ref=sr_1_2?ie=UTF8&qid=1484036923&sr=8-2&keywords=hella+7+inch+h4+headlight