For a 1970-vintage door, the parts that actually fail are torsion springs sized for a lighter wood-panel door, steel tracks that have gone slightly out of plumb over fifty-plus years, and original drums that don't match anything sold new today. We stock standard torsion spring sizes that cover most of what shows up on this era of construction, along with rollers, cables, and center bearing plates. What we don't carry on the truck is obsolete one-off hardware from a specific manufacturer that stopped making parts decades back - if a door has that, we'll tell you straight that replacement is the honest answer rather than hunting for a part that may not exist. With 2,574 households in Northville, we're not running a dedicated inventory for this one area; we carry what covers the 1938-1991 range across the whole territory we serve out of Novi, and Northville's 1970 median sits comfortably inside that.