I assume you need PAR 36, 4.5" diameter lamps.

I just changed two of Dad's 1066 to LEDs from Larsen lights, today(down by the cab steps). The other two were backordered, for the very front. (Haven't had a chance to test at night, yet)

Note: I removed old 35 watt lamps, on 1066; But when I pulled some of the JD 6620 combine lamps, I found 60 watt lamps (4466 lens) so I left them alone

Here's a link to these LEDs (He shows some comparison photos, on his website):

https://www.larsenlights.com/par-36-45-18-watt-flood-light