I have an old (1987) Iseki AT 290 tractor with loader imported to Australia as a used machine. I'm looking for a replacement hydraulic pump to fit. Iseki Japan can't help and I am looking all over. I'm wondering if the same pump was used on other Iseki models. Numbering on the pump is GPLI-123P and possibly 1 - last two digits are not very clear, but would fit more with the numbering of other Iseki pumps - in total GLPI-1231P I'd appreciate any suggestions.