RISERS 
Osco riser part # 3854427
Exhaust riser Volvo Penta/OMC 5.0 5.8 Ford EFI
Used 22 lbs 14x8x4                                                         $95.00 each
Osco part # 50456  4” exhaust outlet 7 degree down angle. Fits Ford and GM V8 center riser style manifolds 3850456   VO 385527
Barr part # MC-20-98502 3 in. 0 degree Exhaust Riser; Fits Mercruiser center rise manifolds; direct replacement for Mercruiser # 98502A2                                                    $95.00 each
Volvo Penta Exhaust Riser 7 ¾ height part # 3862664 (No longer available)
25 lbs; 13 x8x5                                                                     $95.00  each
Osco Part # 3322 6 in Exhaust Riser Extension  No longer Available       $50.00
Barr Marine # 864309 Will dry fit joint exhaust riser replaces the equivalent part # on 4.3 L models also 7 degree 4” V6  V8        $190