I just used the original style retainers from the old cardboard pad. I just cut slits big enough for the retainers to fit through. Its a good thing that the package of those too fat plastic retainers didn't weigh much because I threw them across the shop fueled by vehement and extreme prejudice.
Carl

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission