Carrillo connecting rod question

[Magnum PD]

There are different sets of these connecting rods on eBay, one set says WMC and the other is CARR. The CARR set is $400 more. Anybody know the difference?

 

[Hotrodtractor]

Its the rod bolts. Carrillo has two options for them.

 

[bigaF250]

Which is better?

 

[strokin'_tatsch]

WMC uses H11 tool steel rod bolts (220,000 UTS). CARR uses multiphase rod bolts (285,000 UTS).