I shipped my NOS Henry Abe pistons to Total Seal last week for fitting of rings or piston cutting and fitting. I just got off the phone with Ed at Total Seal. We 900 guys now have good news. Rings that fit are stocked and on the shelf. Henry Abe made 2 different 900 kits however. The kit I have uses the smaller pistons sometimes described as "slipper pistons".
The information you need for ordering is:
part number
203778 Top Ring
201336 2nd Ring
001549 3 PIECE OIL RING
In my excitement I failed to ask all the prices. I did not need to order the top or 2nd rings since my kit had those and Ed seemed to think they were fine to use. I just ordered the 3 piece oil rings at ~ $9.00 per piston. Ed said you can always call with ring/piston measurements and he can hook you up. Thank you Ed and Total Seal.
Jerry