The heavy duty sleeves that I buy from LA sleeve have the same outside diameter on the 87 and the 88 to 90 sleeves.  The heavy duty sleeves have an outside diameter that will require all of the original sleeve to machined out to install the new sleeve.  The heavy duty sleeve also has a rib that has to be removed once the sleeve is installed. 

The sleeves that I have seen on Ebay are very thin and much less expensive are made to go inside the existing iron sleeve.  Heat transfer on a sleeve inside a sleeve is very poor. 

The 87 sleeve rear transfer port has two ports where the 88 to 90 sleeve's rear transfer is one single port.

I charge about 125.00 more to install the heavy duty sleeve than the thin sleeve because of the extra machining time and hand work on the port matching.