spring seat 75mm 900073 , casting suspension parts 

York/YTE type mechanical Suspension ( Both overslung type and underslung type)

1. Overlung and underslung type

2. The leaf spring could be 75mm and 90mm

3. The axle beam could round and square, the size is 5'' and 6''

4. Axle spacing: 1300m, 1310mm, 1360mm ,1540mm

5. Axle beam size: 5'' and 6'' / 127mm and 150mm

6. One-axle, tandem, tri-axle are optional

Please see the following casting parts pictures: