I put a TLU-01 and TLU-02 combo into my drifter. You can find buckets (sometimes) for your particular body but I don't know of any for the A-Class off the top of my head. One thing to consider is that the TLU units are not small: Length: 1.59 (40mm) Width: 1.70 (43mm) Height: .85 (21mm). If space is at a premium, or you don't have enough of a gap to mount it to the body under the hood area, you may want to consider looking at smaller units from other sellers... which usually don't have the cool bling factor of blinking LEDs in conjunction with your receiver (blinkers when turning, brake lights when braking, etc) that the Tamiya has.

Because the TLU units are designed to plug into the receiver, mounting your body can also be a pain trying to have just enough free wire to plug it in/unplug when mounting or removing your body but not so much wire it gets caught in things. You can bypass the receiver and run a separate battery but you lose the neat features and have yet another thing to secure somewhere with the battery.

Overall, I like the programmability and functions of the Tamya light units but the high price and PITA of dealing with wiring and space issues can be a letdown.