This might be a classic example of either pay now or pay later. If you don’t use the correct condenser for your system, the points will arc and pit prematurely and you’ll be replacing them again sooner than you should be. Just because the new condenser fits the mag plate and someone says it’s a correct replacement, doesn’t mean it is.
As for price, there is probably a low demand for the 581419 cap so it is priced to sell while they can charge more for the more common 580321 cap.
