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If anyone is still interested in a new Kirk L-bracket for the K10D with grip, I saw one and only one at Ace Photo. The only difference between the one for the K10D and K20D is the cut out for the sync port. You could simply remove the plastic cap from the sync post, or use a round file to file a small divot in the bracket for use on the K20D. Price is $189.95, which is a more than I can spend or it would be mine.
Their web site isn't set up for buying off the web, but I talked to a sales person and if anyone that isn't local wants to buy it, they will ship it to you. You just need to give them a phone call.
Ace Photo
44710 Cape Ct.
Suite 122
Ashburn , VA , 20147 United States
703-430-3333
Monday to Friday 09:00 - 20:00 (9am to 8pm)
Saturday 09:00 - 18:00 (9am to 6pm)
Sunday 12:00 - 17:00 (12am to 5pm)
Time zone is GMT -5.00 Eastern Daylight Savings Time
Thank you
Russell