White turn signals for front?! AHK?!

I found nothing in the FAQ and with Searches. Which indicators fit in the apron or are there any to buy somewhere?

I heard there's supposed to be some of Porsche's that fit! I once looked at pictures and could imagine that could fit from 944 or 911/964!

Kann mir da mal einer was genaues sagen?

Where is the difference between original AHK and retrofitting? How much can they cost? Where do you get it?

Thank you.