Side adjust so it's probabley a later model .Good old Northwood has the plate ,cheap too .My IPL shows an inner plate and side adjuster .
Parts aren't a problem .Between Northwood and Scott at Chainsawr I'll find them plus I have a couple more sources .
In spite of the fact the exhaust side of the piston is scorched it has plenty of compression.It might just be a buff job and good to go .Fact since I'm thinking about I'm going to trot off to the garage ,pull the plug and see if it has any sticking spots .