First welcome to the PX-10 club! You didn't say exactly what year. From the old catalogs, Brooks Pro was on the 71. The 74 PX-10E had a Brooks-17 or Ideale 90. The 74 PX-10LE and the 77 PX-10LE had a Ideale 2001. My friends original 72 and my 72 came wtih a Brooks, might have been the B-15. I think the B-17 looks the best and have the seat hooks for a bag.