bmx stems all use 22.2mm handlebars, and you can get them in 1" quill or 1 1/8" ahead. The only difference is you need handlebars with the 22.2 diameter. Look for cruiser bmx race riser bars which will fit, you can only run risers with them.
for example these would fit:
http://sourcebmx.co.uk/product/race-products/components/bars-grips/handlebars/sinz-alloy-race-bars/5169.shtml
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bmx stems all use 22.2mm handlebars, and you can get them in 1" quill or 1 1/8" ahead. The only difference is you need handlebars with the 22.2 diameter. Look for cruiser bmx race riser bars which will fit, you can only run risers with them.
for example these would fit:
http://sourcebmx.co.uk/product/race-products/components/bars-grips/handlebars/sinz-alloy-race-bars/5169.shtml