Please let me know the proper spiral to order. Do I need to order anything other than spiral? Worrried about the bottom and how to connect to window. Thanks.
Your dimensions and photo appear to match our S400-18 spiral balance. You'll need to clean the plastic tip at the end of the tube to choose the correct option.
We also offer our 75-005 charging tool to assist with charging the spiral and attaching it to the pivot shoe. Thank you!