there was one with an esco grapple on it on fleabay a while back how do you like the 508 I had a chance to buy one this summer for 10k but was told to stay away from the 508 it was hard to get parts for them :-\
Production of the 508 stopped 26 years ago.Hydraulic rams etc of that age are usually pulled apart to determine their condition and observe/ measure what the appropriate repair strategy is.Bushes are often off the shelf or modified to fit etc.Rotators rebuilt if not totally obsolete.http://www.ritchiewiki.com/wiki/index.php/Caterpillar_508_SkidderThere are few 508s around in various stages of dismantling.There are after market parts for the esco.http://www.rightparts.com/attachments/https://www.6kproducts.com/grapple_replacement_parts.htmlhttps://youtu.be/Sr94dRwPoX4