Tsumura tip, 4 and 6 rivet?

[lostone]

I have noticed on the Tsumura bar's that most show with a four rivet tip but there are some out there that show with a six rivet tip. Did Tsumura make a change or is it only on certain mounts/gauge that they offered the six rivet tips?

 

[birddogtg]

6 rivets is 404

 

[fordf150]

6 rivets is 404

and 325

3/8 is 4 rivet

 

[thechainsawguy]

They did change their tips maybe 6 or so years ago to allow for bigger bearings, so they WENT from 6 to 4 on the 3/8ths tips.

Dave