Unless one is just obsessed with aluminum, bkgrips.com offers same shape adapters but they're molded epoxy. 25 bucks and you'll have them in a few days. I've bought several, fit fine, and as far as design goes I think they beat the Tyler's because they have dual retaining tabs and stay put better.

The problem i always had (back in the 80's when you could get them for a few $$ all day long) was with heavy recoiling guns, they'd twist around until the copper tabs broke off. i had a small boxful i sold as is on ebay years ago. with the additional lower tab, the BK's have not shown this tendency.

Roger