Posted by Tim Holloway [172.70.38.3] on Sunday, March 28, 2021 at 08:02:35 :
In Reply to: Re: 57-68 WM300 NP420 posted by Vaughn [172.68.143.57] on Saturday, March 27, 2021 at 23:39:23 :
"the bolt pattern is common to all models of the WC, M37 series and early power wagon series trucks"
This says it pretty clearly, All models of M37s. He does not say early M37s only.