How many millimeters is the handle bar?

Mine were 785mm width but I bought the raceface green monster limited edition bars and cut them down for my bike but they came at 785mm hope this helps

What size/kind of stem and spacers are needed ?

I did not need anything to make these work on my 2017 Scott soark

Will this fit on the Santa Cruz Heckler?

I think it would depend on the clamp size of the stem you have. I believe 31.8mm is a standard size. As far as the width goed they are very wide but you could always cut them down. Hope this helps.

Color	Orange
Brand	RaceFace
Product Dimensions	30.91"L x 30.91"W
Manufacturer	Race Face
UPC	821973186528
Global Trade Identification Number	00821973186528
Item Package Dimensions L x W x H	31.25 x 2.5 x 1 inches
Package Weight	0.39 Kilograms
Item Dimensions LxWxH	31 x 6.5 x 2 inches
Brand Name	RaceFace
Model Name	Hb12a31.8ora
Suggested Users	Adults
Part Number	HB12A31.8ORA
Model Year	2015
Size	31.8 mm Clamp, 785 mm Wide, 12.7 mm Rise
Sport Type	Cycling

Race Face Atlas Mountain Bike Handlebar

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