Getting Bilstein Standard shocks for my 72 280se 4.5. Shopping around i see so many different part numbers (using Bilstein part numbers). So I would cross reference on different sites and there is no consistency.

I figure the best place to get the correct numbers is from the Bilstein Website. Right?
Here are the part numbers that I got from Bilstein's website-
(rear) Bilstein 24-005371 B4 Series OE Replacement Shock Absorber
(front) Bilstein 24-007061 B4 Series OE Replacement Shock Absorber

I see a few options here on Pelican Parts for Standard Bilstein. For example:

Rear Shocks
B-46-1184 $67.50
108-320-01-31-M12 -$93.00

Both of these don't line up with the old bilstein part numbers either. they are both standard (no hd). what is the difference between these two? and why are they priced so differently?