Dave Sr. from SWISCO responded:
June 28, 2017
Hey, Tom, thanks for posting. Take a look at our 58-182 and 58-183. They both have a 3/16" T-Slot. The 58-182 has a bubble close to 5/16" while the 58-183 has 3/8". Take note that if you are having trouble locking your windows when closed, you might want to consider the 58-182 with a smaller bubble.
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