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Blackhawk S-4 seal kit http://www.hcrcnow.com/view-product.php?kit_id=341

verify your model number again, these are the model number's that have available kits. J-1 1/2 J-2 J-4 JS-2, LJ-1 1/2, LJS-1 1/2 555-B, 556-B 559 590 952, 952-A 953, 953-A 954, 1004 955, 1005 957, 958, 1007 959, 960

seal kit for Blackhawk S-4 http://www.hcrcnow.com/view-product.php?kit_id=341 Drawings available.

Piston cups are available, I have only seen them in Standard not metric. Also they come in rubber(Buna) or fabric. Leather are available, but I can not find them 1 at a time. The closest to the size you need is, 1-1/4"OD with a 1/2" Lip and the center hole you have to make. If this will work...

Some more explanation on seals. Look at the U seal, this is a drawing of "Loaded U cup seal" without the Oring it is a U cup seal. Loaded U cups come with Orings and Quad rings. http://www.hcrcnow.com/how-to-measure-seals.php

The 782 and the 882 use the same seal kit. and The 784 and the 884 use the sale kit. 782 & 882 http://www.hcrcnow.com/view-product.php?kit_id=1102 784 & 884 http://www.hcrcnow.com/view-product.php?kit_id=1107

http://www.ohiohydraulic.com/hein-werner/GH%20&%20GH-1.pdf http://www.ohiohydraulic.com/hein-werner/MODEL%20M.pdf It does not look like a winner. The drawings for "Hein Werner GH-1" and "Hein Werner M"

Drawings for the 93632 http://www.hcrcnow.com/PDFs/Walker_1_5_ton_93630_B_C_D%20_93632%20_F_G_H.pdf

do you still need help?

If you would like the drawings for this floor jack. http://www.hcrcnow.com/PDFs/Walker_2_4_ton_SERIES_K_93655_93656_SERIES_J_93657.pdf