hey yall

looks like i need to replace the ignition coil on my 2001 Sportster 1200S.
It is a quad tower for 4 spark plugs. It has been very difficult to find one in stock anywhere, but this may be my best bet:
http://www.tomsnosparts.com/database...umber_31698-98

it is part number 31646-98 (the one on the link above seems to cover two part numbers)

is there any benefit to getting an aftermarket coil? i found this one from dyna:
http://www.ebay.com/itm/Dynatek-Harl...ht_1465wt_1008

i just dont know about the tech specs that i need to consider.

honestly ill probably wind up with an oem version, but id love input or suggestions.

thanks yall!

brett.