The solenoid bodies/operation are all the same I believe. Its just the pluger that is different. So buy my A-type one, re-use your old plunger, and save yourself £54 [8D]
Thanks for replying quickly Jules ..I didn't know you could change the plunger? the bit that concerns me is the way it attaches to the overdrive.....the A-type and D-type are secured with 2 small bolts but the J-type actually screws in as you can see in my pic...sorry if I'm just being thick?:I