I may not be able to find an OEM windshield (clear) with correct date code so if I need to purchase a repop windshield, which vendor(s) have you folks used and have had experience with? I will assume prices are competitive amongst the vendors but fitment, quality, leakage, etc. are questions I would like answers to. Some of the vendors out there are ECS, AMD, Kool Katz Auto Glass, Pittsburgh Glass Works (PGW) etc.

thanks

The non tinted windshield on my '70 Challenger is AMD and it looks good. The restoration shop bought it for my car so I don't know which vendor he used to get it.
When we discussed the glass options my restorer mentioned ECS date coded glass and he thought it was probably AMD that ECS then etches correct repro markings and date codes on, whereas the standard AMD they put some generic date code and not as good markings on.
I'm happy with my windshield, but not the side glass, and the rear glass is OK but could be better. In certain lighting you see light spot patterns which I've heard is typical due to modern manufacturing techniques.
I believe windshields are made differently than side and rear glass for safety standards and I haven't noticed the "spotty" look in any repro front windshields I've looked at.

All of my tinted glass has been replaced with the ECS glass dated to all my old glass other than the rear roll ups which I found here and is mint, I will say the ECS glass is beautiful to look through, but the car is still in the process of reassembly by myself, but I've no doubt it'll look great once I'm on the road. But I was also looking through 45 year old worn glass with scratches, old swirl marks from the previous owner who hit spots with a grinder/sander or something, and just general spotting and hazing that I couldn't get rid of no matter what I tried.I went with the ECS because they could do the exact dates of my OE glass which I kept...

Last I recall ECS uses PPG and JRD International for glass vendors

Pilkington is one of the better aftermarket glass Mfg.

That's what I put in my 73 Challenger 15 years ago. Very satisfied with it.

I got mine from ebay. It was 120.00. You ordered it online and they have warehouses around the country. Mine was close to me (Pittsburgh area). So I picked it up.