Any authorized Titleist retailer or pro shop should be able to order what you want. I've ordered two through Golf Galaxy and they have shipped directly to the house from Titleist.

They are generally never in stock. Your best friend pro shop can check with Titleist if they still have stock for the 915s to special order.

Try amazon, type in 915 d2 weights. They have sets and singles.

Just checked Amazon:

915 Driver SureFit Weight Kit for Titleist 915 Golf Driver Fairway woods rescue Hybrid wood 4/7/9/11g (4-11g set)
2.9 out of 5 stars 3 customer reviews
Price: $39.00 & FREE Shipping
Only 2 left in stock - order soon.
Get it as soon as May 22 - 25 when you choose Standard Shipping at checkout.
Ships from and sold by XSPANDER.
New (2) from $39.00 & FREE shipping

Do you know what gram you are looking for?

Might want to check EBay....back when I had the 915, found other weights on there.

Golfworks is the best company for stocking O.E.M. club& swingweight supplies. Maltby has been in business for decades. 5 stars for this company.