เห็นมีสองแบบครับ..
แบบกลม ยานนะภัณท์ มีขายได้เลย
แต่แบบแบนนี่คงต้องสั่งทำหละมั้งครับบ
If my memory is correct Yarnapund makes both round and oval. The round one is actually for the early model E30s, and the oval shape slightly larger, has a dent around around the spare wheel side is for the E28 krub.
The oval one can still be purchased from Yarnapund or ordered through some shops, but many of the exhuast shops around Bangkok don't stock them becuase it can't fit or be used in other models krub.