The second link is SD1 pads. if they are listed for Rover 2000, 2300, 2400, 2600 and 3500 they are SD1
I found that these listing are pretty poor. The data has been copied and filtered through most suppliers. Always check sizes and dimensions.
I first realised this when looking for the Rare P4 and P5 pads. they only fit P4, P5 and the armstrong siddley saphire so when listed for other cars it is a dead give away.
The original query is related to the BL parts cats which is a puzzler
Colin