I just scored a set of Record hubs with Mavic GP4 rims laced to them. Aside from being a little dirty and needing hub rebuilds they'll fit the bill on my Colnago Master. The rear spacing on my Master is 130mm and the OLD on these wheels is 126mm. I can get a replacement axle here:

https://www.ebay.com/itm/NOS-Campagn...frcectupt=true

But, is the 134mm axle length right ? I know, I could draw the rear triangle down to the 126mm (2mm on each side) but I really, really don't want to do that. I'd rather the replace the axle.