Shock link P/N question, replacing the original Firestone shocks

[Butch]

I'm in the process of converting to the Lords, referencing SB 20-161. I have bought some salvage parts but when comparing pix on Ebay, etc, I see some shock links that have notches on the flat of the bottom link and others do not. My originals have them and friends that have converted have both.

Can anyone tell me if the "notched"  links are need for clearance or something else? I've seen pix of the same P/N with and without. The nose gear link is the part in question, the SB lists it as 540015-1.

M20 S/N 1154