FindColorSkipBoxArrayTolerance. Change the color to the color of the stile. BTW this works for pretty much everything 
SCAR Code:
program New;
{.include SRL/SRL.scar}
var
StileBox : Array of TBox;
function FindStile : Boolean;
var Tries,i : Integer;
begin
repeat
if (FindColorSkipBoxArrayTolerance(x,y,4934482,MSX1,MSY1,MSX2,MSY2,5,ManholeBox)) then
begin
MMouse(x,y,4,4);
if (IsUpText('tile')) then
begin
Mouse(x,y,4,4,True);
FFlag(0);
Result:=True;
Exit;
end else
begin
Tries:=Tries+1
i:=GetArrayLength(StileBox)+1;
SetArrayLength(StileBox,i);
i:=GetArrayLength(StileBox)-1;
StileBox[i]:=cBox2(x-20,y-20,x+20,Y+20);
end;
end;
until(Tries>=10);
Result:=False;
end;
begin
SetupSRL;
ActivateClient;
Wait(1000);
if (FindStile) then
WriteLn('We have clicked the Stile and are now climbing over :)');
end.