Rt side spindle 3402638

I think they can go either side depending on how you want to mount your calipers. My 74 has them on the back, while my 72 has them on the front. I'm not sure if that or this is correct, the caliper mounting brackets, and calipers can be "swapped" to allow the caliper bleeder screws to be "up top". I think there are different brake hoses depending on which way the calipers are mounted.
I have the basic premise as I've done it more than a few times and pick up something new, knowledge or parts everytime.
I think I see 29 at the end which is a left.
Thanks