L/D or H/D brakes when buying wheel bearings?

[buhler1]

Hi guys. I really appreciate all the great info on this site.

I'm putting ECE dropped spindles on my 72 SWB and when I went to buy new wheel bearings, there was a choice between Heavy Duty and Light Duty brakes. I assumed Light Duty (A6) but when I went to match them up with the new spindles, it looks like the inners are too small. Am I right in assuming I just need to go back and get the larger inner bearings (A5) and retain the outer (A3) because they are the same for both versions?

Also have a question on the relay that runs the high fan speed for the HVAC. It seems the high speed no longer works on my blower. Where is the relay located?

Thanks for the help.

Al