I have a core Saginaw/Delphi box in the garage, I'll check it in a bit.from what I've read, if you have a dmax pickup truck it's almost 100% that you have 3 splines. IIRC when I did my Moog it was 3. I suppose I could remove the locknut and Cognito brace on there now and have a look for sure.
im looking for more of a personal experence than to hear a sales rep trying to sell me their product .Contact Rare Part 1-800-621-2005
You can email them and see what they tell you. They have been very responsive when I've had technical questions with my suspension.
Rare parts sent you the washer and shim?I posed the same question to them, and they said that it will... with a slight modification to the attachment. You'll need to shim the brace out a bit to clear the arm. They sent me a shim (washer) and a belleville washer to complete this task. I am hoping to install everything this week and provide pictures. Here's their pic from in the shop: