Depends on the year model of the bike,
SW Motech made various style belly pans- I had a K6 650cc bike which there were various models of belly pans, but the same basic shape with different hole shapes and positions - they would fit every 650cc bike with the SW/Suzuki engine bars from K4 to L6 - it's reasonable to assume they may even fit the 17> models.
Post a pic and I'll be more specific - also a point to note ref the ventilation - these bikes are designed to operate without modifications in far hotter countries than the UK - Juvecu and Locky went to Morocco a few years back, riding the deserts for 8 hours a day with no issues-
in the Uk in the depths of winter the airflow over the oil cooler/filter particularly on K4-L0 models can cause the engine oil temp drop to an undesired temp.