Note there are 2 variants of the PHM slide – early and current, the current slides part number will have to be modified to fit the early carburettors.
If the size you need is not shown here you can use the 11815 part number but will need to machine part of the ramp off to use them with your carbs.
The important difference is the width of the stop screw ramp – please see picture:-
p/n 8639 Ramp slide 4.45mm wide
p/n 11815 Ramp slide 6.2mm wide
Please measure your existing slides before purchasing a replacement.