Tractordata.com had nothing by various spellings for this brand. I did not look under Shangdong as each time these tractors changed name brands or year models or where they were exported to in what years some few little things might have been subject to change, hence affecting some parts and not others.
I would suggest searching CTOA. They list Nallahey by Shandong. According to the CTOA link for tractors by brand name link Shandong made KAMA, world's best Shantou, Ringo, Taishan. McConnell Mark was listed as being made by Yancheng tractor factory and Shandong tractor works.
Of course most if not all of these tractor factories have changes names and ownership over the years and some came and gone.
Or Chip Urin at Artrac at 1-888-504-8980
If Chip does not know where to get you to parts or where to get you started I don't know who would.