All

I have a O-320-nothing on my pacer. I was shopping for some spare Bendix mags. My current mags are S4LN-20 and S4LN-21. The part numbers are 10-51360-37 and 10-51360-11. When I look at the TSDS for the O-320, it lists the S4LN-20 and S4LN-21 models but makes no mention of the part numbers. But there are a lot of other part numbers on mags with those model numbers. Are any S4LN-20 and S4LN-21 approved? Or, do I need the exact part numbers? If so, where is that documented.

Thanks for any help.
Marc