Two kinds of RO 150 Sander interface pads?

[Scott in Bend Oregon]

I have been using interface pads on my RO 90 with much success on contoured wood edge surfaces and started looking for one for my 150 sander.  I came up with two different part numbers.  496647 and 499257.  It appears the first one is a pad about 15 mm thick and the later is much thinner at 5 mm and comes in a two-pack.

My question is what is the purpose of each?  The 499257 is a more recent part number and I wondered if it was developed at the request of the automotive industry.

 

[gkaiseril]

They both can be used on the RO 150.

The  499257 works with the ETS 150 and RO 150 sanders. This appears to be a newer version with the multi-stream and mount for the ETS 150.

 

[TOOLTOWN]

Sometimes you may want to sand heavily curved, or undulated surfaces, use the 15mm interface pad (or multiple pads stacked).  If you just want to preserve something like a small round over on a counter you can use the thin pad.  That way you can sand the flat and the corner without adding/removing extra pads.

Ken