Photoquip makes grips for several cameras including Bessa R, Leica M series, etc.
The Bessa grip I have is metal on the baseplate and a plastic side grip, as I remember.
The Leica grips are of 2 designs (earlier and later) and all aluminum.
All these grips are nicely done and finished, and really help the use of the cameras.
And, they are fairly reasonably priced.
www.photoequip.net Eric Polson. 800-211-0972 Wayzata, MN
<< note the address is ".net" NOT ".com" >>
Update: The site is up at
www.photoequip.net but under construction, according to an email from Eric. Price of an MD-Grip for the M8 is $147 (currently listed as $174 on website).
---->>> The Bessa uses a grip which is made for a variety of cameras, but it seems to fit the R body perfectly. I will see if I have the specific model and post.
The grip was called a "UniGrip", and it was fine for the Bessa R, for sure, don't know about the other models. No longer available, but may be on ebay.