I have been looking around for one of these and they appear to be quite rare for the 90-91 ES250.
I have a car with less than 60K miles and would like to change the valve cover gaskets/plugs/tubes etc as there has been some seepage and one plug 'popped' up from a swollen seal.
If you have an old manual and would like to sell, please contact me at explorers37@hotmail.com rather than through this forum.
Many thanks, Colin