Advice on Mud Terrain tyres

Hi all

My defender has 33 x 12.5 R15 LT 108 M & S BF Goodrich tyres.

Only problem on nearly full left hand lock tyre catches wishbone strut on near side of Defender.

Will need to downsize on front wheels to stop this happening.
What size tyres do I need to buy to avoid this happening and the ride height remain the same? I.E. tyres the same size in external diameter.
Would like to keep rear tyres but reduce front size tyres to stop above problem.
I do not want to place spacers as this will make further body changes ie wider mud flaps and guards.

Any guidance would be appreciated.
Jon

Just adjust your lock-stop. Defenders don't have wish bones BTW. You mean radius arm.

And you really want the same size tyres front and back or you will get problems when you go in difflock.