Not really, the measurements for the M104 and your 86 M103 are different in many ways. Even if the piston manufacturer was to go ahead and blueprint a design, you will still need to give them specs on what your looking to use them for. I would highly suggest reading a couple of books and put a plan together before you just have pistons made. Nobody is going to do it better than "YOU" if you put the time and research in.
Hope this helps,
Adam

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320