Those are garbage. 2.5 inch lenses using d2s bulbs? Waste of money lol. Minimum 3 inch.
There is a huge in depth description to retros you would need hours reading. There is more than meets the eye.
lol true dat. and that is why i sent my stuff to you. ive spent some time here and there researching retros but theres so much info and alot of it contradicting. best leave it to the pros