The highest quality accordion straps Made in Italy by Fuselli.  

1 Piece Leather Strap (Fixed End Female Connected Not Included)
Longest-40cm(16in)
Shortest-28cm(11in)

Width-5cm(2in)
End-3.8(1.5in)

The width measurement is the middle of the strap. The end is where the strap enters the accordion.

Search ebay item number 161860355761 for the female bass connector or any other hardware needed. 

Here's a list of features:

1. Adjustable - You can customize the length easily and quickly. 

2. Extremely Durable - Central strap is made of the best quality Italian leather.

3. Value-Priced -- These are direct imports from the manufacturer in Italy, and are priced to be as affordable as possible without international shipping costs. 

4. Comfortable -- These straps are padded.

5.  Attractive -- Deluxe Italian leather straps are of the finest quality available, the perfect accompaniment for the professional or amateur accordionist.