Hank, Bosch metric guide bushings are not available in the US and it may be that the SAE sizes are not available in Europe. Because of your location you might be best off getting a Trend UniBase for your 1617. Trend offers a very large selection in metric sizes and a set in SAE sizes. The router in the photo is an MRP23EVSK with the UniBase attached.
If you choose to go with the Bosch accessories then the RA1151 centering cone is a very good idea. The RA1126 is the quick release adapter which mounts between the motor and the sub base plate. Bosch guide bushings or the RA1100 adapter with a PC style guide bushing is inserted from the bottom. I think the Bosch set up is best when used with PC style bushings of brass. These brass sets are available from many sources and I prefer the sets with all the collars the same length. This way you only need one thickness of template material. I highly recommend that you use the dust collection accessories with your router, I use them with mine and they do a good job. This is part number RA1173AT.
"Living in the D" (this means Detroit!)
"It's fine to disagree with other members as long as you respect their opinions"
Last edited by Mike; 03-24-2014 at 11:55 PM.