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We have BCM20732, BCM20736/7 chips with thickness 1-1.2 mm, but these chips support BT4.1. Apart from this, there is a Murata module Type 1GR having CYW20736.
Unfortunately we do not have BLE module less than 1.7-1.8mm thickness with higher BT version support.
Please refe https://www.cypress.com/products/ble-bluetooth for more details.