To the best of my knowledge, this is suitable for a:
1950s BMW R5 / R51.

Hepolite / Brico Covmo equivalent part number (believed):
9849 / *

Relevant measurements taken from this piston are as follows.
Piston diameter: 69.45mm (so, +060 where 68mm would be standard?)
Height: 67.5mm
Compression height: 33.5mm
Pin diameter: 18mm
Ring width: 3 & 4mm

General notes for my pistons:
- Please look at the photos and the large versions closely.  These pistons have been in storage for 50-80 years or more.  There is a chance there are imperfections (from casting, shelf wear, test fitting, marks or scratches etc) and may need a honing/polishing or similar.  In my opinion the pistons are perfectly usable but that does not mean you will agree so please study the photos.
- Please see the photos.  If the piston does not have a pin or rings shown in photos, it does not include a pin or rings.  If it does show a pin, and that pin has pitting on it, you should remove the rust before removing the pin so as to not score or scratch the piston itself in preparation for use.
- I also cannot promise if said pin, or clips, or rings will be usable.  They are more susceptible to oxidation and rust and so you should, again, see the photos.  If you have doubts then assume they are not usable.

Estimated shipping weight (kg): 0.5

Please take a good look at the pictures.

We ship with FedEx or regular post (for lighter items).  PLEASE NOTE: Some regions are "Out of Delivery Area" by FedEx and they charge around £16 extra to deliver.  If you think this might apply to you, please message us with your post code.

Often times we list items on Ebay that are also for sale at our store-front.  This means we occasionally end items early if they sell locally.