Sports are valved stiffer than HDs, I believe.
After doing a ton of research, thinking, and planning, I bought a set of P30-0032 (34-184530) from AJUSA earlier this summer. Looks like they're still on sale: http://www.ajusa.com/Bilstein-34-184530-Monotube-Strut-Insert-ab061a.html
Here's a link to my thread with a photo of the parts, including the correct gland nut (which Bilstein calls a "Ring Nut") part number for 240Z/early 260Z strut tubes (B4-B30-U232B1, big thanks to John Coffey for that one). This makes the Bilsteins almost a plug-and-play affair, just need to fab a strut spacer.