"Boy you really had me excited there for a while, until I confirmed what I suspected all along. Your C.V. Joints are NOT "914-6", they are "914-4". You can Google your part number and start reading. FYI... I have several pairs of factory OEM 914-6 half-shafts with the correct 914-6 c.v. joints with pn 914.332.029.01 and those are "25 Course Splines", and NOT pn 914.332.029.33 with "33 Fine-splines".
I thought you miight want to know, and avoid any issues with a future buyer.
Seller's Comments: I have four brand new NLA (no longer available) Porsche 914/6 CV joints for sale. These were purchased approximately 1982 from a Porsche dealer. These are the real thing. Six 8mm bolt holes. (not four like the 914/4) These have been no longer available from Porsche for over twenty five years! Perfect for that concourse car or restoration project. Or maybe you own a real 914/6 and your joints are worn out.