[71blksuper4x4]

Buddy buckets were a 67-68 truck and suburban only option. Blazers weren't introduced until 69', so there were never any buddy bucket blazers made. Buddy buckets are good for a bench seat truck as they bolt in the existing bench seat holes, but for a blazer, you would have to drill new holes.

As far as a cloth seat for 69-70. There are no cloth seat covers (OEM style) that anyone makes as there were no option as far as I know for cloth. The only cloth bucket seats ever made for 69-72 are the 72' Highlander optioned trucks and blazers. Highlander trucks and blazers featured a vinyl trim with plaid cloth inserts. You will not find someone making these seats as I believe the only place that carries the correct NOS plaid material is SMS auto fabrics. You would have to buy the plaid and set of reproduction seat covers, and then have a upholstery shop fit them in the seat covers.
Your best bet is to have a upholstery shop make you some covers if you want cloth. If it still has 69-70 bucket seats in it, make sure you get 69-70 covers for them, as the foam shape is a little different between 69-70 and 71-72. Trevor