2004 Sportsman 500 HO: No grease fittings on suspension bushings

I recently bought a 2004 Sportsman 500, and am starting restoration work on it. I noticed there are no grease fittings on any of the suspension connection points. All of my other IRS Polaris ATVs have them (2001 and older models). Is it worth drilling into the A-Arms and installing grease fittings, or did Polaris accurately determine that grease in those joints doesn't add much in terms of durability?