survivalsheath.com offers a great kydex with Tek-lok...I have one and have made several of my own using this design....I have older trailhawks that didnt have a bolt in the head....I bought a newer one a while back and it didnt fit as well in the sheath..I called survivalsheaths and he told me the newer ones are for the updated TH.....I have about every hawk out there (every style of RMJ Forge/Tactical, K5, LMAX, Emerson, ATAC, etc.) but I always have my trailhawk with me...you just cant beat it!
good luck