All PAR36 are 4.5 inch beam, OEM one on the Cub are PAR36 4411 12V 35W screw terminal unit. Here a link to help you find substitute.
http://www.brite-lite.com/Products/Sealbm.html
PS: to find the diameter of a beam just divide his PAR number by 8.
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Gilles.
1988 2072 401 54" hyd angled blade
1988 1872 364 snowblower/C50 deck
1976 1650/QA42A blower/44A deck/standby
1976 1450TS/Sleeve hitch/44A deck/in storage
1963 100 (red)/in storage
2010 Kubota 2380-2/42" infinity deck (engine swap)
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