There was no help at all from about 1970, actually about 1965 until 1984 when the Indult was issued. Even then, the hostility on the part of many Bishops and Priests to allowing it was palpitable.
About the only places where you were able to find an Extraordinary Form Mass in those years was if you lived in an area with an elderly Priest who was excused from learning the Ordinary Form
AND if there were no other Priests in that particular Diocese that knew how to celebrate the Ordinary Form. A few parishes did adopt both forms but most did not. As far as a group that retained the Extraordinary Form, at least in principle, the only one I know of is the Norbertines Order. England had something called the Agatha Christie indult which allowed periodic celebrations of the Extraordinary Form at certain prescribed locations. It was by no means widespread. Almost all of the socities that we have today came about in the years following the issuance of the indult by Pope John Paul II in 1984. They were not around prior to 1984. .
In fact far from a wide and generous application as requested in the indult, some Bishops threw up obstructions which almost completely would negate the ability of the faithful to attend one. In one fairly famous scenario, the Archbishop stated that the Old mass as he called it, did not in any way serve the spiritual; needs of his flock or of anyone else for that matter, but in obedience he would graciously one Extraordinary Form Mass to be celebrated in the Arcdiocese per month under the following restrictions:
It could not be celebrated at any Archdiocesan Church, Chapel or meeting hall.
It could not be celebrated on a Sunday.
The name of the place for the celebration had to be submitted to the Archdioces by the Wednesday preceeding the celebration, and if the location was not approved, the Mass could not be celebrated.
The Mass could not be held in the same place for any two consecutive weeks
AND to show true generosity I suppose, he decreed that
Only those who had been alive,of adult age and practicing Catholics in 1964, could attend the Mass. Everyone else was prohibited from attending.
So in short from 1970 until 1984, it was virtually non-existant. After the indult, things got better in some areas, but still by no means was it an easy task to find one except for a few certain areas.
There was a lot and I mean a lot of hostility to the Extraordinary Form of the Mass in those days.