Need help on front disc conversion 1972 swinger

The stock Kelsey Hayes brake system works with those wheels. Yours appear to be the 14 X 4 1/2" version.....in case you need that info with an aftermarket system.
Where can i find the kelsey hayes brake system? And are you sure it would fit my rims? Everything i read online since yesterday suggests that no disc brake conversion fits those stock steelies unless they are rallye. Just trying to be cautious about it because i dont know if i can afford new rims too at the moment.