I wont include single esc options for this batch yet, maybe a future one. Gonna prepare for the batch start of next week.
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Could you please share the dimensions of the larger inside area of the new design? I might want to order 1 more or 1 less depending on if it fits my boards 
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You mean the finned part that protrudes outside of the enclosure?
No, the plate that sits on the inside of the enclosure
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it’s 132 by 85 mm and the thickness of the part inside the enclosure is 4 mm
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Hmm, that would actually barely fit a 3rd board I’m working on, but unfortunately I just realized my D75 doesn’t have the extra holes for mounting a heat-sink to, so I think I’ll reduce my order to just a single heat-sink.
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Holes are overrated. Silicone is supreme
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Just get some adhesive TIM and stick it on
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MakerX sold me a bottom case with holes for $15 + shipping. They said it fit both Batch 1 and 100/250 versions of the D series.
I should be receiving it in the next couple days, so I’ll update then to confirm whether it does fit Batch 1 models
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No problem, I made some extra anyway to have some stock for the website.
And otherwise, silicone would work too like glyphics mentioned. You could press the esc and heatsink together with a clamp and then lay a bead of silicone along the edges of the esc to glue/keep it in place on the heatsink. Should hold up with a decent silicone like sikaflex or something like that.
Update: the new bottom plate does fit! I’m for sure interested in a heat sink now.
Also, it looks like the FETs in the Batch 1 D75 have aluminum casings 
is this what makes these ESCs perform so well thermally?
The lettering on the FET appears to be:
MR
7759
HU0G
1323
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Thats nice! Most higher end ESC’s have metal casing FETs, but could be that the makerX ESC’s have a better thermal transfer than some other options out there.
I will probably have the new heatsinks available in 2 weeks.
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They’re infineons directFETs.
Ever since vedder started using them in the VESC6, they’ve been present in alot of designs.
Since the package is exposed metal, it should be easier to cool. But theres alot of great transistors out there for alot cheaper price so this does not my any means, make or break the ESC.
some swift fingers on my calculator says that these FETs can handle around 40A (DC) without any heatsink at 25 Celsius.
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Added a document with the cutout template, ESC mounting guide and technical drawing below and to the product page.
UNISINK Cutout, Mounting & Technical Info V1.0.pdf (379.8 KB)
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d100s is 30x95
@SabreDynamics if u would implement the bean shape u did for me before to the heatsink, then it would support both the dv4s dv6s and d100s
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@YUTW123 shared in the D100s thread that it’s 33x90. Do you have a D100s in hand to confirm the measurements?