I agree; usually they have a Pilkington in stock or within a week but last year, not so - it puzzled me as well.Seriously?
I just had my dealer replace my windshield with an OEM one, insurance paid for it all. (AZ has no deductible on glass)
They did a very nice job, and I had them replace the pillar clips. Should have had them put on a new cowling, but I'll do that later on.
A few years back I had the shop install a new cowling and also both A pillar covers; with the new windscreen, the 3 looked new.
I have wondered about new windscreen wiper arms as the paint on the current ones is far from brand new. The arms cost money however.