I have fitted mine with a standard diameter spring though shorter (AJPS). All bolted up ok though the spring could perhaps be better located. Of course, the role of the strut top is not to locate the spring, and my top spring locaters are very old and hard rubber and would normally be held captive by a longer spring. Having said that, this car is yet to go back on the road so cannot be more informative sorry. Are the T3 tops specifically designed for small diameter springs with adjustable platform or will they also suit standard diameter springs. Realistically I wil need to wire my springs in to stop them flopping about.