Drott 4 in ! cylinder substitutes?

[john450]

I have 1970's 450 loader/crawler with leaking Drott 4 in 1 bucket clam cylinders. It is next to impossible to find seal kits or even separate packings. This drott is serial #977 and I think it is the earliest version of cylinder design from Drott.
Short of dismantling and trying to match the seals individually I wonder if any one has successfully upgraded the cylinders to a newer part #.
Or does any one have a good source for parts or substitute part #'s on these oldies?
Thanks ...John