Riser gasket question

[pursuit2460]

I have a 2000 Mercruiser 5.7 EFI TBI B3. I just noticed saltwater buildup on one of my risers, they are Barr but don't know the age. I also noticed that to the touch the leaking riser is hotter. Anyways, I will be replacing both sides. When I go to Boats.net for the riser gasket part number, it gives me this number, 863726, which is an open gasket, not the restricted one with the 2 holes. I have a FWC system but raw water for the manifold/riser. I did recently replaced the gaskets and the parts guy said mine takes the restricted one and gave me a reason why but can't remember. Will call him tomorrow to ask why the restricted vs open. So I have looked all over the internet and I am just as confused. So many replies to this question. So is Boats.net right or my parts guy? Serial L635326

​

 

[pursuit2460]

4c.  Closed Cooled engines with the raw water from the heat exchanger going to the
90-degree fitting on bottom of the exhaust manifold:
Use P/N 27-863726 Gasket – 4 Slot between the exhaust manifold and the exhaust elbow.

Just found this from a Mercury service bulletin 99-10. So I guess my parts guy was wrong and Boats.net is correct.