Howdy,
I found this OMI on eBay:
https://www.ebay.com/itm/373155077889
It says it's for early 5U and 3J. I looked in the ACMOC library's OMI for the early 5U and it says 7and1/2 gallons so you should be right.
Craig
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
Chapter Two
| Newby Hall, Ripon, Noth Yorkshire, HG4 5AJChapter Two
| Freshfield Farm, Sloop Lane, Scaynes Hill RH17 7NP UKChapter Two
| Avalanche adventure, Welford Rd, Sibbertoft LE16 9UJ, UKChapter Two
| Highacres Farm, Dewey Lane, Brackenfield, Derbyshire DE55 6DB, UK
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