Help with ID'ing 904 trans

Hello,

I have a '65 /6 Valiant and when I bought it 5 years ago, I was told by previous owner that the transmission is not original to the car. Just need to get new seals kit I'll need based on trans year (pre-'72 or '72 up)

Here are the numbers I see on it:

Bell housing: Large 871-2

Trans (might be a dead giveaway): got 66 in a circle, KCP in an oval and 2466871 with a 2 under it

On the pan lip: 2538386Y 2191332

Tail piece: same 66 in circle and KCP in an oval and 2466880-2

Forgot to count the splines, but I will if that will help ID'ing.

Thank you for your help!

PS: Do they sell just the seals for the trans or do I need to buy a whole new rebuild kit? PO said that it was rebuilt, it's just I had the car in storage last 5 years and trans is leaking out of speepo, shifter, kickdown. I want to get front and rear seals as well.