Well, the three factory locations have been covered already, but there's a few loose ends.
The chassis itsself, is pretty plain. Standard Structure, Standard Armor, the 300XL's a little exotic, and it's got an Omnimech Gyro... but its really not too demanding on the tech base to build the base mech, if you can get clan 300 XL's or shop em up yourself. We even had the Hauptmann for a bit, as a poor man's Dire Wolf substitute. and then from 3090ish and onwards, we have the Tomahawk, a slightly more exotic cousin of the Dire Wolf. There's also the odd case of the Night Wolf. Now, you might be asking, Steve, what the heck does the Night Wolf have to do with this? Well, if you were looking to build a Dire Wolf past its factory-extinction, and you could get that standard structure fabbed, the Night Wolf is using the same electronics packages. Tundra Wolf uses the same reactor.
Wolves own Solaris. VEST is probably one of the best groups you could ask for if you wanted to cobble a mech together. All told, if you can get Keystone to fab you a Standard Structure Materials version of the Tomahawk II Chassis, drop in a Tundra Wolf's 300 XL, a Night Wolf's Electronics, a Tomahawk II's Omni Gyro, and Standard Armor from anywhere you please, it might be a little quirky, but there's your 3145 Dire Wolf, presuming you have the clout to see that all come together. But, if you don't, don't worry. the Tomahawk II's an off the shelf replacement for the dire wolf's role. a worthy successor.