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"SHALLOW" ..the main thing about this fan is is depth.. 2.7/16" or 63MM.. most others are about 87mm or 3.5" in old school measurements.
METAL Fan Blower wheel for the 60's to '92 ... largely..for cars without factory Air Conditioning.. .. ..also suitedfor housings that have narrower fan housings.
Wheel size across is normal.. 5.25 (roughly 108)mm ..its the depth that catches some converters out .. who may by going from a AC car to non.. or trying to accommodate a tighter engine bay area etc..
This has a depth.. or WIDTH.. is 2.7/16 which is roughly 63mm.
Also note. this wheel has the least offset..of 7/8th inch (21mm) meaning it will fit most all motors.. with its face touching the motor face plate.
..unlike this fan wheel with a deeper fan .. needing a deeper offset ..needing a deeper shaft. of roughly 1 11/16" or 42mm .ie https://pontiworld.com.au/usgmsp/product_info.php?cPath=15_135&products_id=5156