E body Exterior Mirrors

I'm confused, sometimes that doesn't take much, about E body racing mirrors, 70 & 71.
Do 70 mirrors have a shorter base than 71 & is the drivers smaller than a 71 drivers mirror?
I know the 70 pass. mirror is narrow compared to the 70 drivers mirror
& I think the 71 pass. mirror matches the 71 drivers mirror.
Are 71 E body racing mirrors the same as 71 B body racing mirrors?
I appreciate any feedback, Thanks!

70 mirrors have a shorter base. The 71 mirrors have a bigger base and head. I believe the b body in 71 used the same mirror as the e body. In 70 the mirror head was the same as the a body sport mirror.

70 ebody is 70 only.
71-74 ebody same as 71-72 bbody
73-74 bbody only

Thank guys, that what I thought on the mirrors. Wasn't sure about the bases. Short for 70, longer on 71s, got it!