Despite fitting a new clutch primary gear oil seal it failed on starting up and leaked

I have now stripped the flywheel off and ready to fit another new one.
I have ordered 13H2934 from Bullmotif which I understand fits all models 59 - 92 however I see they also suggest GHS101 for early coil spring cars, so Ive ordered both.
Has anybody any experience of which I should use for this car?

(Apart from the seal failing Im happy with how it all looks)