I suspect some after-market producer makes one, but the original 87 degree celsius is what was intended for the 103 motor. A cooler t-stat can sludge an engine.
If it's running hot, the cause will need to be determined. Perhaps the existing one is tired or you have air in the system. This is a common problem on 103 motors along with a long list of other possibilities.
The SEARCH facility will bring up all of these.