A door built to 1985 sizing and a door built to current code aren't quite the same animal. Panel thickness, insulation standards, and wind-load bracing have all moved since then, and if your door or opener is original, a direct swap-in replacement part may not exist anymore - we've had to upsize or special-order hardware to match older track widths and spring drums more than once.
Here's the honest limit: if your opener or spring assembly is original to a mid-1980s build, we may not be able to source an exact match, and in that case replacement beats patching it together with parts that half-fit. We'll tell you straight if a repair isn't worth it versus a new door sized to current standards. For a household in this income bracket, that's usually a decision worth making once rather than paying for the same failing part twice.
If you're in South Venice and your door is acting up, call and describe what it's doing - age of the house helps us guess the hardware before the truck even leaves.