I'm not exactly sure what component you're looking for but the "R" reference designator is usually used by circuit designers to denote resistors.

Anyways, these component suppliers have a plethora of component values, in almost every package and footprint available (surface-mount, through-hole, etc.). It's all a matter of picking the proper value, whether it can tolerate the required electrical stress, etc.

http://www.digikey.com
http://www.mouser.com
http://www.newark.com

... Much more around too. Even Radio Shack from time to time has the component you need.

OK thanks 😀
Might experiment when I have the time.

I'm guessing you're talking about these things? Those indeed are high-current power inductors, probably 0.45 to 0.6uH assuming the markings are anywhere close to the standard notation. The current ratings are a bit trickier to determine, since they're not usually marked... but as long as you get one the same size, the rating should be close enough. (The current capacity is determined by the gauge of wire, so for the same inductance and current rating you'll have to have the same number of turns of the same gauge wire, and therefore the same physical size. Likewise, if you want to upgrade the current capacity, you will need a physically larger inductor due to the larger gauge wire involved.)

The thing is, though... inductors don't generally go bad unless you grossly overload them. They're just coils of wire and some ferrite. What makes you think they're the problem?